On the train ride home from his convenience store shift, Yuuji discovers his mucous roommate has taken the form of colleague Takamiya and strikes up a playful chat that draws unwanted attention from the girl beside him. After apologizing to smooth things over he slips into the bathroom to collect himself, only for the slime to transform into that same girl in a tight competitive swimsuit, her big boobs on full display as it splits to become Takamiya in matching attire. The double vision makes it impossible for Yuuji to contain his hunger in this hentai tale, stirring cravings for oral exploration and creampie release.