The kind Teacher Tsubomi is bullied by a villainous shota...

Buds x evil shota work! An escalator school attended by rich kiddos. Parents' associations are a major sponsor of the school. The new teacher Tsubumi is stricken by the principal who is trying to protect himself, but due to his sense of justice as an educator, he slaps the evil kid. The furious parents have them sign a contract of "absolute obedience" that triggers the tragedy, and they begin their humiliation class with Tsubumi-sensei.