It was mentioned in Drama C.D, that he was named Hachiman because of the fact that he was born on the eighth of August. Since his birthday falls in summer vacation, he was never wished a happy birthday every year by his classmates. He never received any chocolate from the opposite gender during Valentine's Day, even from his own mother. He played Jenga game alone, with no other player to play with him. 
When he was a kid, he didn't have many friends, and so he invented the new sport of one-player baseball. He would throw the ball by himself, hit it by himself, and catch it by himself. When he tried to devise a scheme to make the game last as long as possible, he realized that super bat-and-catch was the best way to lengthen the game. This gave birth to his final serve named by Zaimokuza as Meteor Strike in Tennis court showdown against Hayama and Yumiko pair.
He feared of asking anyone about the content on an upcoming test, and instead, he just studied silently alone and then faced the consequences directly later, because of his unwanted past with fellow students. This leave him with no choice of clarifying doubts or lessons, especially in science and maths leading to poor grades.He always walks behind them like a shadow and they never took his opinion for consideration Which is mentioned by him in the Light novel of his past many times.This is a similar trait of Rumi Tsurumi.
Until the end of his middle school there were a lot acquaintances whom he thought to be his friends but they didn't seems to be treat him the same way. They just treated him as someone to laugh at. In light novel it is clearly mentioned that they introduce Hachiman to others as a laughing stock & classmate but not as friends, which dissappointed him in friends.
In bonus drama C.D of volume 3, It was mentioned that once Hachiman was invited to a birthday party because the whole class was obligated to go but was not invited second time which Hachiman feels that he might have made some fatal mistake
It was mentioned in light novel that Hachiman was not invited anywhere by his acquintance whom he thought to be friends and when he coincidntally passes by their party site they would either make "why is he here?' face or "who is He?" face.The atmosphere there is mentioned to be dead because of his presence which Hachiman mentions in the current time line more than once..
A glimpse of Hachiman's past can be seen on the double date where Hachiman wasn't texted or invited. Another is Kaori's treatment of Hachiman throughout the double date, where she was constantly poking fun at him for invalid reasons to praise Hayama in comparison to his actions and also to keep their conversation lively, as if Hachiman is nothing more than a laughing stock to them.
Before Middle SchoolEditIn elementary school, students were doing a folk dance. Hachiman was paired up with a girl but she didn't want to hold hands with him alone. The other girls followed suit. In Hachiman words, he danced with the air for the "Oklahoma Mixer"  in 4th grade, his classmates forgot his name and nicknamed him "Hikikaeiru (Hikifroggy)". They made jokes that were related to his nickname. 
A group of kids were playing tag while Hachiman stood still. The "it" aims to pass a virus named after him. They imagine that the Hikigerma virus was so powerful that barriers were ineffective.  In the light novel, he played Mario tennis by himself. He received corn as a birthday present by his mother's friend given to him by her son who he thought to be his friend.
Once his classmates decide the splitting of groups. Hachiman was waiting for an opportunity, but his late homeroom teacher, Isehara-sensei tells to other students that she knows all of them dislike Hachiman, but it's unkind to leave him out. Hachiman still didn't forgive his late home room teacher for that as he hates being sympathised.
Middle SchoolEditIn middle school, there is a chummy atmosphere between students and teachers, everyone addresses each other by first name with the exception of Hachiman. Hachiman shown to be in his desk reading alone. Hachiman was the victim of verbal bullying in junior high and thus he continued his former loner's life of not wanting to get hurt or hurt others.
Classes got reshuffled and everyone exchanged numbers. Hachiman mustered courage and eagerly searched for a girl. He found one and she reluctantly exchanged numbers.  Hachiman used to text girls often. In Hachiman's words, he would get a dismissive reply 40% of the time (he says that he text them at 7 P.M but gets reply in the morning like “sorry, my battery ran out” or “looks like I was out of range for a bit” or "I was sleepy, see you at school" ) and 30% of the time he would get no reply.
The remaining 30% was from a foreigner called mailer-daemon  (he didn't seem to know, that it is a program to indicate that the mail was not delivered due to various reasons), indicating that the girl likely gave him a fake address. At some time, Hachiman went to Chiba village for nature studies , which he later visits again after joining Service club as summer activity.
When he was in 8th grade of new semester, the role of class male representative was dumped on him by the fellow male students. While a girl volunteered for to be a girl representative, that girl frequently talked to him. He thought she was interested in him. One day, he decided to ask her who she liked. She replied with the first letter which was "H". Hachiman asked if it was him. The girl was surprised and disgusted.
The next day Hachiman saw a drawing mocking him on the class chalkboard much to his shock and dismay the whole class know about it, even though it was just the two of them at that time (in anime and manga adaptation).   In the light novel, after the incident the girls hate him even more and the boys nickname him "Narugaya" (Narcisst-gaya).
At some point, it he attempted to engage in conversation with a girl, but the girl replied, "Um, could you stop please?", with a near blank expression and extremely cold eyes. This made him self-proclaimed himself as a "leading expert in rejection."
In drama CD, it was mentioned in middle school that there was a girl he liked who belonged to the wind instrument club. On that girl’s birthday, Hachiman gave her a present, by staying up all night compiling a bunch of anime songs to recommend. He paid careful attention to the song selection. His present was accepted. But tragedy occurred the next day. At lunch time, in the PA system of the school, The broadcast committee chose his song by saying : ‘"Aaaand the next song was requested by Class 2C’s Otagaya Hachiman-kun (snicker), a love song (snicker) for Yamashita-san!’". After this incident, the name Otagaya passed on even after his graduation which is mentioned by his sister Komachi who is studying in the same school.
Before or after the above confession, Hachiman confessed to another girl (In light novel Kaori-chan). Her response was to instead "just be friends" but they never spoke again.She is the only girl to whom Hachiman officially confessed so far.
Despite the fact that the confession was private, it was made a public knowledge of the class and gossiping topic the very next day. The gossiping girls felt sorry for Kaori that Hachiman was the one to confess to her and were glad that they didn't give their contact IDs to Hachiman while sneering which can be heard by Hachiman very clearly.   
The last time he talked to a girl was two years before the current time in June. He made a joke in response to an unnamed girl who was complaining about the heat. It turned out that she was actually talking to another girl seated behind him.
What followed was an awkward situation. Whenever Hachiman recalls this memory, he hides and screams to himself under his futon.  
It was mentioned in the light novel, once, people used to throw wrappers of local specialty sweets in his shoe locker, the perp was clearly one of the girls from his class and the fact that they would not even try to hide their criminal conduct made it hurt him even more. Whether it was a field trip or any other school outing trips. It was also mentioned that he had also been through a confessions of love by the opposite gender as penalty for losing at rock-paper-scissors, fake love letters written by boys who copy down what girls dictate to them. When Hachiman went to receive a medal for the A score in Sports test during the closing ceremony, everyone burst out laughing.
In Volume 7 Chapter 4 in light novel, It was mentioned that in middle school he had to pass along a letter folded like a diamond or open blouse, unaware of the written insults of him on it.In the flash back sequence in time of Hachiman request in anime version, it is shown that Hachiman is almost same in middle school as he is in High school, reading novel in class without speaking to anyone, playing squash in gym session, walking home alone while others are walking back in a group & talking.
After middle school, Hachiman doesn't want to have any contacts with his middle school classmates, which he states as a Reset or Deletion in relationships. Hence he worked hard to enter Sobu High School where his middle school classmates would definitely not go to. It was mentioned in the light novel that every year, only one person from Hachiman's middle school goes to Sobu High because of its high standards and requirement. However by coincidence, he met Kaori Orimoto later in the series.
He goes to school by bike, despite the long distance and intense weather of hot summers and blisteringly cold winters, the main reason is to avoid running into classmate and acquaintance of his.
On the first day of the High school entrance ceremony, he was excited about his new student life, to the point which made Hachiman run to school an hour early. While traveling he spotted and saved Yui's dog from a potential car crash, also sealing his fate of being a loner for the starting of his high school life.The result was a bone fracture that caused him to be bedridden in the hospital for three weeks. This put him on the fast track to his loner lifestyle, since everyone else had become acquainted and grouped up by the time he arrived. He was forced to join the Service club by his future counselor, Shizuka-sensei, in the hopes of fixing his rotten personality.
At some time in the past, Komachi ran away from home once because she hated returning to an empty house. It was Hachiman who found her and he has been returning home before her ever since. However, in the light novel it was mentioned to be a lie told by Komachi to make Saki understand her brother's worries, as Hachiman is surprised and has no recollection of the incident at all.
In the light novel, Hachiman is the only one who doesn't get space to write his future goals in year book. It was also mentioned that he had a lot of part time jobs before joining the service club but none seems to exceed more than 3 months. The reason seems to be that he couldn't get along with anyone because of his past. This and his poor scores in sciences and maths lead him to the choice of becoming house husband.Hachiman frequently sleeps in class during break or his free time due to his lack of someone to talk to. If he isn't sleeping, he may be reading books and giggling. He also giggles while reading amusing stuffs in novels in both the club room and class room, "grossing out" Yui and Yukino. 
At lunch, Hachiman eats alone at his favorite spot because of the nice sea breezes that blow in from the shore. During gym class, Hachiman practices against a wall by himself, as usual by his own scheme, since he doesn't have a tennis partner, thus he plays squash.
He suggests practical suggestions to all the requests to the service club, he goes to the extent of scapegoat or take blame himself for the sake of others, as he very well knows that the society will blame someone when something bad happens and someone will definitely become the short end of the stick. This is seen when he uses a selection of crude words towards Sagami in order to make her fulfill her duty as a cultural festival chairwoman. As a result, he receives a negative reputation from those who hear about it with exceptions of those who know his true intention. Fortunately, it blows off as time passes.
Hachiman is someone whose existence are barely noticed, even to his fellow classmates. This can be seen when he came late to his class once, almost all his classmates give him a stare that suggested that he was a stranger, and when Yui asked them his whereabouts, they didn't recognize him eventhough he was from the same class as theirs. During the tennis match, while the spectators cheered for Yumiko, Yukino and Hayato, none gave him even one. After the tennis match, Hachiman recieved two or three conversation as an acknowledgement of his exsistance which also blown away.
After the infamous rooftop incident, Hachiman received negative reputation from them. He is also subjected to condescending jokes as seen in Tobe's Somethingtani-kun on his surname, much to some of his classmates' amusement. When Tobe says Hachiman is unreliable during his request to the Service Club, Ooka and Yamato giggles in agreement.
In the light novel, Sagami's clique often make sardonic laughter and pass insulting gossips about Hachiman. Fortunately, due to the good times they have in Kyoto, this soon ceases. Furthermore, the rooftop incident is known to select few only, such as the planning committee members, 2-F students, Haruno, Shizuka, Atsugi-sensei (his reaction is unrevealed) and possibly Komachi as well. So, Yukino's statement of Hachiman becomes the most hated person in the entire school is somewhat questionable, and she is simply teasing him. Furthermore, during the sports festival, Hachiman is able to participate in without receiving hostility from his schoolmates, apart from the disgust from the girls when he hands them the baton in the marathon (it should be noted that even before the rooftop incident, Hachiman is already unpopular with the girls).
He currently choose Liberal arts as his third year course.
Difference from pre-High School lifeEdit
He is in a club and takes on the work more seriously, even though he hates to work.His social circle also extend some what but doesn't deepens with anyone. While Kaori once mentioned that Hachiman wasn't in any club in middle school and was also mute that many didn't know about is exsistance
Hachiman was mentioned to be mute/unsocial by both Kaori and Yui in times of their debut, but as the series progresses, he is able to interact with students from different classes and even of a different school, Kaihin Sougou High without any issues. However, after he and Yukino criticizes the school's student council, he gained a negative opinion from its member, and Tamanawa refused to socialize with him during the Christmas event. Fortunately, this is temporary since he was able to participate in the Valentine event hosted by their schools without any major issues. This indicates that his social and communication skills are improving slowly.
Hachiman somewhat changed in terms of growth which is noticed by Shizuka sensei later in the series. Unlike his previous school life, Hachiman participated in planing committee of Cultural Festival and Athletic Festival committee. He also volunteered for Christmas collaboration event & Pre valentine event on behalf of his school along with Kaihin Sougou High. Hachiman also participated in the athletic festivals even though his team was disqualified for cheating. To defend his action in the athletic festival, Hachiman stated that he believed that no one was watching him, for he planned to use foul methods but according to Yui almost everyone was watching him including Yukino. Hayama in the opponent team kept an eye for Hachiman.
Hachiman is in good term with at least of two girls. In High school there were more than one situation for Hachiman either to go out on a date or date-like situation with girls, primarily with Yukino, Yui, Iroha. He also went on a double date with Hayama, Kaori, Chika, though only because he was scared by Yukino's elder sister - Haruno.
Kaori whom he had a crushed and got rejected in middle school ,now patched up things with him and she even goes to the extent of giving him valentine chocolate and offered him to be her friend.It was also mentioned that Hachiman sweat profusely when talking to girls especally Kaori in past but now he casually talks to any girl including Kaori without any nervousenessKaori once mentioned that it was rather rare to see Hachiman anywhere outside, even in the region where his house is located which is also agreed by Haruno. Hachiman also never received any invitation to hangout or any celebrations in the past. Hachiman also mentioned that one time he invited a person to hangout who turned down the offer for family reasons but was in the same place as Hachiman suggested with someone else.
But currently Hachiman is mentioned to hangout in places with his acquaintance. He visited game-arcade and theatre with Saika and Yoshiteru in times of summer vacation .Also places like destiny land, Aquarium, Shrine with Yukino, Yui and Komachi.
Hachiman also participated in the Christmas and birthday celebration of at least two of his club-mates and turn down the offer by Yui to celebrate his own birthday in summer. Hachiman had a bad history of giving gifts which were either rejected or laughed at. But his gifts are treasured by atleast two personals.
Hachiman helped a lot of aquintance under the service club.Hachiman is relied by the student council headed by Iroha in times of Christmas colloboration event and also relied by council headed by Meguri in times of athletic festival planing committee.It also not far fetched to know that the success is either directlly or indirectly rest on Hachiman's doing.
Hachiman was made fun off, ignored and looked down upon by his past acquaintance which is a sort of bullying throughout his past school life but when Komachi enquires about his High school life he was unable to explain but comparatively he says that he is not bullied, He looks at Yukino's word as nothing more than jab as it is.
Hayama, the most popular person in school, is mentioned to have some kind of inferiority complex towards Hachiman.
In the past Hachiman's contact were not exchanged or exchanged for fake ids or never responded for his message. While currently two to five members of his school mate have his contact information along with his home-room teacher and atleast two of them are frequently texting him.He also received valentine chocolate as a pretext from his club mates and also a courtesy cookies from Yui more than once and also is former middle school crush promises to give him courtesy valentine chocolate.
Hachiman also received Valentine courtesy chocolates from Iroha, Saki and keika.
In light novel he begins to change is future plan from household husband to something else but didn't reaches any conclusion, but plans to enter a random university in Chiba first and decide later. Shizuka encourages Hachiman to be a university professor which he declines.
- ↑ 1.0 1.1 1.2 My Teen Romantic Comedy SNAFU Anime: episode 7; part B
- ↑ My Teen Romantic Comedy SNAFU Anime: episode 8; part A
- ↑ My Teen Romantic Comedy SNAFU Anime: episode 5; part A
- ↑ My Teen Romantic Comedy SNAFU Anime: episode 4; part A
- ↑ My Teen Romantic Comedy SNAFU Anime: episode 7; part A
- ↑ My Youth Romantic Comedy Is Wrong as I Expected Manga: chapter 2 pg.27-28
- ↑ My Teen Romantic Comedy SNAFU Anime: episode 1; part B
- ↑ 8.0 8.1 My Youth Romantic Comedy Is Wrong as I Expected Light Novel: Volume 1; chapter 1
- ↑ My Youth Romantic Comedy Is Wrong as I Expected Manga: chapter 1 pg.21
- ↑ 10.0 10.1 10.2 My Teen Romantic Comedy SNAFU Anime: episode 1; part A
- ↑ My Youth Romantic Comedy Is Wrong as I Expected Manga: chapter 1 pg.26
- ↑ My Teen Romantic Comedy SNAFU Anime: episode 5; part B
- ↑ My Teen Romantic Comedy SNAFU Anime: episode 3; part A