"Oh...this boy is going to be wank material for the rest of my life."

Hisazumi, a college student who likes to make others feel good through sex, is asked by Heki, whom he has never met before, to have sex with him. Hisazumi, who has had sex with both men and women, agrees to the request, but Heki's wish is to have the “best sex” that will be a lifelong source of entertainment for Hisazumi. Hisazumi is supposed to satisfy him with sweet sex, but Heki tells him that it is not so different from masturbation.

Hisazumi tries to make Heki feel good in every possible way to save his honor...?