While masturbating in a manga cafe, Aihara-kun was caught by a girl from his class, Hirasaki-san, at the moment of his ejaculation. To make up for it, Aihara-kun gets to see Hirasaki-san masturbate! However, masturbation doesn't end there and things develop into sex! It's his first time having sex, and he wants to moan out loud, but he tries desperately to hold it in! Hirasaki-san has become addicted to doing it in places where he shouldn't...!? He can't control his sexual desire even when they go to karaoke for their first date, and they end up having sex! A youth story about a beautiful girl who has a happy orgasm through lovey-dovey sex! A collaboration with a popular doujin work! Based on the original doujin works "Mankitsuchu" and "Mankitsuchu 2" Click here for the Karaoke version!