いえのかぎ

Hiroshi Kuroyanagi, a boorish failure of an elementary school teacher, is blackmailed by his student Rika Sakuma, a girl with demonic intelligence, into a wild scheme to rob the school of a hidden fortune worth tens of millions of yen. Lies, cheating, and betrayal...students and teachers struggle against one another for dominance in this suspenseful thriller. Who will come out on top and claim the schools hidden fortune? [From Steam]