芽依と細田は幼馴染。芽依は長い間、細田のことが好きだが、細田本人は鈍感な男でそれに気が付いていない。放課後、学校で下ネタを話している細田たち。「オナホール」を男達全員で買って試してみようぜという話を偶然聞いてしまった芽依は、そんな下品でバカなことはやめてと注意する。しかし芽依に反論してくる細田たちの話を聞いて、芽依は大好きな細田のため自分がオナホールになるアイディアを思いつき…

Mei and Hosoda are hood friends. Mei has long been in love with Hosoda, but he's an oblivious guy and doesn't notice. After school, Hosoda and his friends are talking about dirty jokes. Mei accidentally overhears them talking about buying an "onahole" (masturbation aid) and trying it out, and warns them to stop doing something so vulgar and stupid. However, after hearing Hosoda and his friends argue back, Mei comes up with an idea: to become the onahole herself for the sake of her beloved Hosoda…