Daigo, who lives with his best friend, ends up looking after his friend's sister, Misaki, one day at his friend's request. At first glance, Misaki appears to be a petite beauty at 142cm tall, but she's actually quite the naughty girl! She teases Daigo with glimpses of her lingerie and nipples, driving him wild with teasing and near-intercourse. There's no way he could possibly resist this! As his rationality explodes, he ends up fucking this adorable little devil all day long!