The somewhat timid protagonist, Kazuhisa Kenmachi, has a crush on his classmate and coworker, Yuna Matsukawa. During summer vacation, Yuna is entrusted with the care of Masahiko Tamashiro (Ma-kun), the son of the wealthy Tamashiro family.
However, the boy who arrives at the Matsukawa house is rude, arrogant, and possesses a strong libido like a monkey in heat.
Yuna Matsukawa has almost no experience with men, and of course, she’s not going to be able to enjoy her summer vacation without incident…
