“Huh...? No way, don’t shove it any further...!” A man named Mr. Tokura is a trainee, who joins the same gym as Matsuri Isumi, a beautiful gym trainer he admires. The problem with Matsuri is that she gives really strict guidance on a daily basis. One day, Matsuri accidentally drinks alcohol, which she can’t handle at all, and she carelessly falls asleep in front of Mr. Tokura. It’s just the two of them alone in that space, and she exposes her plump thighs and casually opens her legs... Upon seeing her, Mr. Tokura says, “This is payback for everything you did...” He starts touching her nipples through her sweat-soaked shirt and even removes her shorts... Her pussy reacts to the stimulation even while she sleeps. She wakes up after a long groping and wonders... “Why he it... inside of me!?”