スクール・ウォーズ～卒業戦線～

The story takes place after Shiori graduates and now she has a month before she starts college. Unfortunately the school gets slammed with an investigation and instead of spending her spring break having fun, she has to spend her spring break making sure nothing weird happens so that their school isn’t shut down. Also to add salt to the wound, aside from Itsuki and Shinya, all the relationship statuses with the rest have been reset.

[from Hinano's post]