Atsushi, who failed his university entrance exams, is what society calls a hikikomori. Unable to bear it any longer, his father asks a colleague's wife, Haruka, to be his tutor. Despite having experience as a tutor, Haruka finds herself at her wits' end with the unmotivated Atsushi. Then, Haruka comes up with a strategy to make him focus on his studies… It involves using her own hands and mouth for perverted guidance. And the intense lessons gradually escalate…
