However, the 13th sticker appears in the first OVA.
It is rumoured to be Yui Yuigahama that puts them on the sign.
There is a pattern of new stickers being put up when 2 conditions are met.
- After a request has been solved.
- Shortly before or after a new request is received.
A potential 3rd condition is that Yui must be around to place a sticker. As it appears no stickers are placed when she is absent from the club.
Season 1 EditThe first/bottom row of stickers starts in the first season. (Stickers 1-13)
- The 1st sticker is a pink and white skull & crossbones wearing a top hat. There is a pink bow on the hat and pink heart beside the skull. It is seen in Episode 2 just before Zaimokuza is introduced.
- The 2nd sticker is of two strawberries and a small flower. It is seen in Episode 3 just before Yui brings Totsuka to the club with his request.
- The 3rd sticker is a small character, consisting of a face and large purple mushroom with yellow dots for a head or hat. It is seen in Episode 3 shortly before Hayato comes to request the Service Clubs help.
- The 4th sticker is a cupcake with green icing and a cherry on top. It is seen in Episode 5 after Taishi requests that the Service Club help his sister.
- The 5th sticker is a pink ridged circle with 2 small bears on it.
- The 6th sticker appears to be a rock or marble with a face on it and a pink lightning bolt through it. It has the word ROCK under it in different coloured letters.
- The 7th sticker is a purple and pink butterfly.
- The 8th sticker is of 2 mushrooms with faces. One is blue, the other is red.
- The 9th sticker is of 2 red roses. Stickers 5 - 9 all appear in Episode 10. These stickers are shown on the sign after the first Culture Festival meeting. And immediately before Sagami asks the Service Club for help.
- The 10th sticker is a large hamburger with some stars.
- The 11th sticker is a pink guitar and small heart shape beside it. Stickers 10-11 appear in Episode 12. The sign is shown after Hachiman is finished cleaning at the Culture Festival and returns to the club.
- The 12th sticker is a red high heel or stiletto. It is seen in Episode 13 after the Athletic Festival wrap up.
- The 13th sticker is a jeweled crown. It is seen in some versions of the first OVA  and briefly during the first version intro for Season 2.
Season 2 EditThe second row of stickers starts in the second season. (Stickers 14-26)
- The 1st (14th) sticker is a black and yellow alarm clock with red accents to make it appear as if its ringing. It is shown in Season 2 Episode 1 after Hachiman's status update and before Hayato brings Tobe to the Service club with his request.
- The 2nd (15th) sticker is a dark blue star with yellow dots and a yellow outline.
- The 3rd (16th) sticker is a cruller pastry/doughnut.
- The 4th (17th) sticker appears to be a ornate ball.
- The 5th (18th) sticker appears to be a coloured Rorschach design. 
- The 6th (19th) sticker is of two multi-coloured hearts.
- The 7th (20th) sticker is a small white duckling.
- The 8th (21st) sticker is a fish that appears to be "kissing" an eel.
- The 9th (22nd) sticker is of Pan-san the Panda, a popular Destinyland mascot. Stickers 15-22 appear in Season 2 Episode 9. The sign is shown immediately after the intro (Way before they go to Destinyland).
- The 10th (23rd) sticker is a festive coin. It is seen in Season 2 Episode 10 immediately after the intro.
- The 11th (24th) sticker is a pink and red object. It is seen in Season 2 Episode 11 just before Yumiko goes to the Service Club with her request.
- The 12th (25th) sticker appears to be a small tornado.
- The 13th (26th) sticker is the word "Thanks!" in different coloured letters. Stickers 25 and 26 appear in Season 2 Episode 13. It is the very first screen of the episode.
- Sticker 24.5. In OVA ZOKU half of the 25th sticker is shown. The sign is seen immediately after the intro.
Episodes Without New Stickers. Edit
- Episode 1 - The sign is shown to be blank, right before Shizuka introduces Hachiman to Yukino and requests that she "fix" him.
- Episode 6 - The sign still has the same 4 stickers as the previous episode. It is shown shortly before Shizuka stops by to request that the Service Club "replenish it's human resources". And It's shown again before the reconciliation with Yui.
- Episode 7 - It is the beginning of the Summer Break/Camp arc.
- Episode 8
- Episode 9 - The conclusion of the Summer Break/Camp arc. They are at school briefly, but the sign is not shown.
- Episode 11 - Start of the Culture Festival arc. The sign is not shown.
- Season 2 Episode 2 - They are in Kyoto.
- Season 2 Episode 3 - The sign is shown just before Hachiman returns to the club room on the first day back from Kyoto.
- Season 2 Episode 4
- Season 2 Episode 5 - The sign is shown after Hachiman convinces Isshiki to run for president. Before he returns to the club to inform Yui and Yukino about what happened.
- Season 2 Episode 6 - The sign is shown when Yui and Hachiman go to the Service Club together.
- Season 2 Episode 7 - The sign is shown as Hachiman and Yui talk outside the Service Club.
- Season 2 Episode 8 - The sign is shown after Hachiman stays up all night thinking about his actions. And before he enters the Service Club the next day.
- Season 2 Episode 12 - The sign is shown as Hachiman talks to Yui briefly outside the clubroom. However the angle is not clear enough to see all of the stickers.
The Yui Theory EditIt is assumed that Yui is the one adding stickers to the sign. Whenever a request is fulfilled, and she returns to the club room a new sticker appears.Some evidence supporting this:
- She has similar stickers on her bag.
- Stickers are not put on the sign when she is absent from club/school.
- After her argument with Hachiman in episode 5.
- During the summer break arc.
- When away in Kyoto.
- When club is suspended for Iroha's student council request.
- The following photos.
- One photo appears to be of Yui scheming to put the stickers up.
- And the other photo is of Yukino scolding Yui for the "vandalism".
When the episodes were broadcast originally in Japan there were sometimes short intro and outro scenes that were removed from the Blue Disks and many Fan Subs. These photos are from the television outro after Episode 13. 
Some breaks from the rules are:
- In Episode 12 stickers (10-11) appear on the board at some point in the Culture Festival. Yui may have added them at some point, but it doesn't follow the pattern.
- In Season 2 Episode 3 no stickers are placed by Yui. She may consider both Tobe's and Ebina's requests (Season 2 Episodes 1-2) to be failures, hence, no new stickers.
- In Season 2 Episode 9 eight stickers are placed on the sign. It does not seem to relate to the number of completed requests. But it does match when the Service Club returns to normal.
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Needs Confirmation.
- ↑ 2.0 2.1 http://ameblo.jp/junsb/theme14-10019720745.html
- ↑ Half of the sticker is shown because OVA ZOKU takes place between Episodes 11 and 12 of Season 2. This supports the 1 sticker per episode theory.
- ↑ Chronologically it is seen before Season 2 Episode 13. But in release order it is seen last.
- ↑ https://m.gamer.com.tw/home/creationDetail.php?sn=2431698