Yumeken Terauta was raised as a rich young lady. She attends a prestigious university where many of the children of distinguished families are enrolled, has a boyfriend and is living a smooth life. But one day, tragedy strikes her. On the day her parents are going on a trip, she invites her boyfriend over to spend some time alone at home while she is cooking, when the intercom rings. Thinking that it is her long-awaited boyfriend, she rushes to the front door, only to find a group of strange men standing there...