To capture a wider audience in Japan's home-video market, BISHOP and publisher AiCherry collaborated to release interactive DVD/Blu-ray versions, such as the major January 28, 2016 Blu-ray Game release.
The story takes place in an all-girls school where a new teacher, the protagonist, begins her career. Unlike her predecessors, she faces a classroom tainted by the influence of a mysterious entity. This entity, known as "Kyoudan," exerts a corrupting influence on the students, leading to a series of events that challenge the teacher's morals, authority, and understanding of her role.