One rainy night Kiyoshi Mizuki happens upon a young man (Yayoi Saiki) sitting next to a vending machine without an umbrella. Being a nice guy, he invites Yayoi to stay at his place.

While Yayoi acts kind of weird, the two head to bed without issue... Not.

Yayoi assails Kiyoshi while he sleeps...?!
Lewdly begging for him to reciprocate, Kiyoshi gives in to Yayoi's requests and~...