An amnesiac might be a key figure in Detective Mackenzie Stone's search for his own wife, who disappeared five years ago.

故事发生在90年代的西班牙，年轻的作曲家乔从故乡柏林独自一人前往伊维萨岛，在这里的一家非常有名的夜店中，乔找到了一份DJ的工作，他希望这份工作能够成为他进入当地电子音乐圈子的敲门砖。

The story revolves around a first-year high school student, Teiichi Niiya who had just enrolled at Seikyou Private Academy. When he gets lost in one of the school's old building, he meets a girl named Yuuko Kanoe who reveals herself as a ghost with no memories. Teiichi then decides to investigate her death by delving deep into the infamous Seven Mysteries of the storied school along with Kirie Kanoe, Yuuko's relative, and the oblivious second year Momoe Okonogi. Throughout the story, Teiichi and Yuuko discover the truth about these ghost stories and help those who are troubled all the while inching closer to the truth behind Yuuko's death.

A wind has swept the Earth taking all the memories from everyone. No one knows who they are, how to speak, or how to use the tools of modern civilization. Two years later, a young man who has been re-educated travels across America on a mysterious journey.