His mother has been acting strange lately... Yosuke, the son, suspects that his mother Naho is cheating on him. And his bad premonition turns out to be true. When the family is out, his mother brings her lover into the house, passionately entwining her tongue and groping each other's private parts... Yosuke is overcome with anger, but when he catches a glimpse of Naho's voluptuous body, which is unimaginable from his mother who is always diligently working at the housework, he lets his emotions take over and attacks Naho's voluptuous body.