Ichika is an innocent and pure sister who has feelings for her brother. After giving her brother a blowjob during his morning wood, she seduces his friend with a crab-legged cowgirl for the first time to get his attention! In order to improve her sex skills, she interviews for a sex shop, where she wears a restraining leotard and experiences squirting covered in oil, vibrating him, cleaning up with a blowjob, cowgirl position, and facials! After growing up like this, Ichika and her brother finally have forbidden, intense, lovey-dovey sex!