The Mystery Club at Caiyang No. 1 High School is unlike any other club. Though it calls itself a club, in practice it accepts requests to solve mysteries.
A yandere girl sends an anonymous letter for unknown reasons; the music room lights up on its own every night at ten; according to a school ghost story, a girl in red has her hair cut short the next day; classical music is heard inside the library even though it's locked; and a challenger claims their puzzle can't be solved... With club president Xia Tianlan around, solving one incident after another is just an ordinary day for the Mystery Club!
(The cover and the story don't quite match →_→ Maybe I'll redraw the cover someday.)
