Yuka decides to seek a sugar daddy to earn money to buy a present for her boyfriend on the condition that she only masturbates before the man.
Her boyfriend, Masato go to the spot to make a protest but Yuka is raped by Shuzo, her sugar daddy before her boyfriend's eyes.
Shuzo takes her photographs and threatens her. And this incident involves even Kaoruko, Yuka's mother.

[from DLSite English]