Fushi Kitan Kyuukon: Sennen Shoujo

Summary

Motoki belongs to the news club at Yuzuhara high school. One day, his underclassman Kaede confessed to him and he accepted it, becoming lovers. They started to investigate one of Yuzuhara-chou's seven mysteries, about the fenced fields, but the club leader Maki started to look like she was being possessed. A mysterious girl who thy met at the dam, Mitsuki, told them that it all stemmed from a bulb (kyuukon) that he had buried. (Source: Hau~ Omochikaeri!)