Touma Hikaru is a student at the prestigious Izumo private academy. Recently he is troubled by dreams that always has the same woman trying to tell him something. One day, following the steps of the dream he had last night he goes to the abandoned building at the back of the school. When he touches a mirror there, there is a flash of bright light followed by an earthquake. He rushes out to the new school building only to find Nanami being attacked by a giant spider. At that moment a bird appears and everything stops. But this is only the beginning of the strange events to follow those two...

[Translated from Getchu]