Jokyôshi himitsu no hôkago

A high school teacher Rina who has been married for 5 years seemed to have a happy life on the surface but in reality she was dissatisfied with her husbands sex with her and wanted to masturbate alone Was met One day her sister Aki brought her fiancé The other party was a student Sumio who was held by a new teacher Rina to be fucked in an empty classroom Rina tries to avoid Sumio as much as possible but he does not allow it and opens the gap to reach Rinas body and asks for the old relationship And while Rina is away from her husband she goes crazy by her sisters fiance becoming a lewd sister