Bara no Jumon(1989)

Bara no Jumon

A beautiful and enigmatic girl, Midoriko Hibiya, transfers to the class of Morio Suzuki, a very ordinary high school boy. It turns out she has two faces. By day, she is a slightly eccentric high school girl. After school, she is a member of the Golden Rose Society, which can make any wish come true, even murder, for the right price...!?

Suzuki is a nice guy, and he tries to befriend Midoriko, who doesn't care about fitting in at school... But the strange requests that keep coming to the Golden Rose will involve them in some unusual incidents...

(Source: Booklive, translated)