Tenshi ga Ita Kyoushitsu

A classmate, Amane, who was known for being angelic and flawless, has died under mysterious circumstances. In response, the class is conducting what appears to be a funeral for her. Despite the somber event, the students remain quiet and fearful, keeping their thoughts to themselves. The narrator suspects they are concealing something. Prior to her death, Amane made an odd remark, hinting at the possibility of betrayal within the group. To uncover the truth, a class meeting is being held, with the condition that no one may leave until the matter is resolved.