Takuma Ota was a perverted anal maniac who would secretly film the toilets in the school and rank the girls anuses.

One day, the school idol, the young lady Shizune Yukihira, discovers his secret...! Shizune, who learned the protagonist's secret, says---

"C-Could you fuck my anus!?" An unimaginable word is uttered.

How high will Shizune's anal fuck stage rank go!? He will fuck the young lady he thought was very cute and pure into an anal maniac!!