Kegareboshi

This is an anime adaptation of the Doujinshi of Sato Kuki.

Kokoha is a young woman who aspires to become a renowned idol as part of the duo of novice idols StellaResta.
One day, Kokoha has a sexual relationship with his manager Wataru, but inadvertently, Kurotsuka A member of his team found out. Unfortunately, the latter will use it as a way to blackmail it Kokoha to satisfy his desires.