The good-natured Iseya leads a peaceful high school life. One day, she hears a pained gasp from the infirmary... When he peeked into the bed, he found Misaki, a gangster with bad eyes from the next class, staring at him with an agitated expression. He suddenly pushes him down, asking him to "stick your fingers up my arse"!　he had to have her ass tweaked to get off, he said with tears in his eyes, and they had pseudo-sex as requested, but he couldn't leave the defenceless Misaki alone...? 平穏な高校生活を送っていたお人好しの伊瀬谷。ある日保健室から苦しそうな喘ぎ声が…。ついベッドの中を覗き込むと隣のクラスの目つき悪いヤンキー・岬が昂ぶった表情で伊瀬谷を睨んでいた。しかも「おまえの指をケツん中に突っ込んでくれ」と突然押し倒されてしまう！　尻をいじってもらわないとイケない体質なんだと涙目で岬にすがりつかれて、求められるまま擬似セックスをしたものの、無防備な岬が放っておけなくなり――!?