Fukashigi Triangle

The woman who I fell in love is no longer in the world. Yousuke Kageyama is a second grade of high school who has extraordinary spiritual inspiration. Because of it, the leader of exorcist club, Juri Kyougetsu request him to investigate an old western style house. He meets Kurea Kuromozaki there. He saved her from an evil spirit, and he fell in love with her at first glance and confessed his feeling to her. However, she was Miona Kuromozaki and possessed by her big sister's spirit. In this way, their strange triangle relation started!! (Source: Gentosha, translated)