The Paranormal Investigation Club investigates the strange occurrences that happen on school grounds. Recently, the students have noticed the old dumb waiter working by itself. Is this the work of a malevolent spirit or something worse?

Seikyou Academy is an ever growing collection of buildings and structures. There are classrooms that became storage, stairs that no one climbs, and hallways that end abruptly. Teiichi is lost in one of the older sections alone…

Teiichi is not the only one who can see ghosts; he receives a letter to meet with the sender. They tell Teiichi he is being haunted and will be dragged down. Do they not see the same Yuuko, he sees?

The Paranormal Investigation Club is holding a training camp at the school. Teiichi sees Yuuko from the corner of his eye, but she is not stopping to talk to him. That night she takes him to a forgotten part of the school, to see the cursed rock.

There is a rumour going around about a monster called Akahito. The students are adding to the rumour and it is getting out of hand. Mob rule breaks out leaving the paranormal investigation club in danger.

Yuuko hasn't really been herself recently; it is something Teiichi can't put his finger on. Kirie hears the voice she originally thought was Yuuko. The truth is starting to come together and with that the danger increases.

Yuuko's memories of Teiichi and everything they've done together are gone. Teiichi is losing his ability to see her and slowly also his memory of their relationship. What will happen to the paranormal investigation club?

Yuuko's memories are back but something is off. She is displaying emotions that Teiichi and Kirie have never seen before. With these new emotions, Shadow Yuuko begins to lashes out more.

Trapped within the memories of Yuuko, Teiichi is re-living her last days alive. He will witness and experience all that she felt including the birth of something darker.

Yuuko can no longer see or hear Teiichi; he has become a ghost to her. When he reaches out for her, it only causes pain.

All the mystery have been solved, Yuuko is whole once again. But now that she has no regrets anymore, can she still remain a ghost?