Rei attends Nagi Gakuen which is well-known for strange happenings. Since he was small, he has been able to sense spirits. One day, he met a mysterious girl at the abandoned old school building and many strange things kept happening afterwards. Deemed as the main culprit, he is invited to the 4K club (kagaku de wa kaimei dekinai kaii genshou o kenkyuu suru kurabu – club to investigate strange phenomena which cannot be explained by science) by club leader Otoha, but he doesn’t want anything to do with it.[From Hau~ Omochikaeri!]