You wake up in an underground room, you are still wearing your school uniform, in the basement there are several prisons, but the prisons are empty, then you slowly got up and walked while looking around, and a boy watched from one of the prisons at the end, the boy wasn't wearing his clothes, he was only wearing his trousers, his hair was messy, yes, he was a victim, he was used as experimental material.

The boy's name is Kaiser, Kaiser continues to watch you as you walk closer to his prison, Kaiser's eyes look tired.