Nayuta was one of many students who attended “EDEN” on a small solitary island called “Angel Island”. The enjoyable time that he spent together with his friends was put to an end by a sole black box and a “girl in black”.

Surely, it will be all right. It’s best to keep forgetting the past which should not be remembered and continuing living their lives with their angel-like friends who have gathered in EDEN. The nightmare on which the girl leads them has yet to end...