Super cool news, Yahari Ore no Seishun Love Come wa Machigatteiru fans! In fact, there are four pieces of news to share!
First, apparently the anime will adapt the content from Wataru Watari's original light novel series up until the sixth volume. This means that fans will get to see the cultural festival story plot! Even better is our 2nd piece of news: Yahari is getting a spinoff! A brand-new anime-only spinoff episode has been green-lit and it is set to air the week after Yahari's 12th episode.
In terms of video games, production on a separate new original video anime has also been green-lit! It will be bundled in the limited edition of the tentatively titled Yahari Ore no Seishun Love Come wa Machigatteiru PlayStation Vita game this summer.
Lastly, since Watari was the original writer for the novel series that Yahari is based on, it makes sense that Watari himself is writing the scripts for the anime spinoff episode and the original video anime bundled with the game! Both are supposed to be stories that were not in the original light novel series, so both the spinoff and the video anime will probably have the same style that fans loved so much in the novel series!
Source: Anime News Network