The Punishment Classroom (Delinquent) Game Over is an ending which occurs if Eric(a) is sent to the Punishment Classroom again after having already gotten three delinquent points during previous visits.
Appearing in the classroom Eric(a) finds they are already bound to the desk, immediately cursing. Having found them to be unteachable, the Teacher resolves to drastic methods. The teacher raising a mirror to Eric(a)'s face they are appalled to find a vagina on their forehead. Revealing a gigantic penis beneath her skirt the Teacher declares her intent to literally fuck Eric(a)'s delinquent mind into oblivion. Immediately beginning her task Eric(a) screams out in both pain and pleasure, their mind erased entirely as the Teacher orgasms.
Eventually in the real world when Marianne gets suspicious about Eric(a)'s body not moving after some time, she determines the worst, but manages to create an artificial personality for the now empty husk. That said, Eric(a) as a person is functionally gone.