Anal Mania Otaku to Ananie Daisuki Ojou-sama ~Kiseki no Matching~ 1

Oota Takuma was a maniacal pervert who was obsessed with butts. He secretly filmed the school toilets and ranked all the girls" asses. And then one day his secret is revealed by the untouchable idol of the school, the sophisticated ojo-sama Shizune Yukihira... And then Shizune, who now knows the secret of the main character, tells him:
—“C-could you... train and properly train my ass, please...!?”
A phrase that no one in her life expected to hear from her. To what level will her anal training rank rise!? Let"s turn this sweet and pure ojou-sama into a complete anal sex addict!!