The series follows high schooler Takuya, who unexpectedly gets propositioned by his quiet and seemingly innocent classmate, Kaori Onodera. She reveals a hidden, insatiably horny side, initiating a purely physical 'sex-friend' relationship. Their arc is a cavalcade of raw, unprotected sex where Kaori constantly demands Takuya's cock, begging him to fuck her pussy and creampie her in various settings. Their encounters escalate in intensity, featuring deep-throat blowjobs and a focus on her ecstatic reactions to being filled with his cum. The plot thickens when Takuya's busty, tsundere childhood friend, Miki, discovers their arrangement. Far from being upset, her jealousy morphs into desire, leading to explosive threesomes where both girls compete to get fucked by Takuya, ride his dick, and get covered in his seed.