Recently, Shota has been obsessed with the huge breasts of his friend's sister, Shiori, whom he has known for a long time. He challenges her to a wrestling game so he can bury his face in her huge breasts, tries to take a bath with her, and checks out her breasts with a straight face while saying he's checking out her swimsuit... Shota, who has a strong sexual desire, plays pranks on her J-cup huge breasts!