One day, a disaster occurs and the normal life of Chibana Michiru comes to an end. He wakes up to a strange voice calling him, in front of him stands a classmate he has never spoken to before. He knows that they are inside the ”mysterious room”.

One day, a disaster occurs and the normal life of Chibana Michiru comes to an end. He wakes up to a strange voice calling him, in front of him stands a classmate he has never spoken to before. He knows that they are inside the ”mysterious room”.