Mizuura Yukari

A beautiful swimming instructor who looks good with short hair.
With friendly and cheerful personality, she is very popular with children and the elderly who attend swimming club.
She currently has an engaged boyfriend.

However, even she has a hidden fetish "Actually, I love fat men very much".
She feels unsatisfied in sexual life with her boyfriend.

After first meeting with the protagonist who fits her ideal perfectly, the nasty side in her begins to run wild.