Takuma Ota is a perverted anal maniac who secretly films the school’s toilets and ranks each girl’s anus. One day, his secret is discovered by the school’s idol, the rich girl Shizue Yukihira…! After learning the protagonist’s secret, Shizue says… “W-Would you please train my anus?!” The words she utters are unimaginable. How far will Shizue’s anal training rank rise?! This young lady, who we thought was very cute and innocent, is trained to become an anal freak!

Shizue’s anal training was steadily advancing. A dimly lit gymnasium storage room. Shizue, both hands suspended, in a shameful pose. Both legs also bound, her body floating in mid-air. Into her widely spread, completely exposed anus, liquid is injected one after another, the fluid that reaches all the way to the S-shaped colon inflates even the rectum, and finally a foreign object is thrust inside. At the first sensation of her anus being pried open and torn apart, her nipples become erect, while drooling tears and saliva nonstop, she repeatedly reaches climax over and over. The anus that was once like a tiny bud has become a lewd, wide-open vertical-split asshole even more obscene than a pussy, and with that the training is complete.