Tomodachi Game, 23

Goodbye, friends! The final round of the adult version of the Friendship Games involves getting rid of teammates who are no longer useful. Haragawa loses consciousness, possibly from eating some of Yûichi's poisoned rations, which draws attention to the supposed killer controlling him. When Shinji tries to uncover their identity, events take an unexpected turn... culminating in a showdown between the heirs of Taizen Shiba! The origin of Shinji's name is closely tied to the inferiority complex he feels when he's with Yûichi.