After being exiled and disowned by his father, Yama Juugo arrives in Nanaejima, an artificial island which also known as the Special Student Zone, and is glad to be free. He arrives in his apartment he rented only to be greeted by Ryuugajou Nanana, a ghost who resides in Juugo's new room. After playing some games with Nanana to determine who's the master of Juugo's room (and breaking his arm in the process), Juugo does some research about Nanana and even asks the landlady, Shiki Maboro, about her time with Nanana before her death...