Hideo is the only new boy in the class, he is still bullied because of this. Today, Mei asked Hideo to massage her. Seeing his beautiful older sister wearing a short dress revealing her underwear made Hideo aroused. He used the excuse of massaging to rub his penis against her panties. The next day, he continued to use the excuse of massaging to satisfy his sexual desire, but this time Hideo wanted more, he wanted to have sex! So he pulled down his sister's panties and inserted his penis! Mei found out and didn't allow him to do that. But after many persuasions, Mei went from letting him rub against her panties, to letting him penetrate 1cm, and then letting him have sex with her as he wanted!