It's been 10 years since the last time we saw her. Umi, the hopelessly cute niece, has returned home, transformed into a hopelessly free-spirited, sadistic beautiful girl. She takes her kind and serious uncle out for a ride, teases him in the car, eats his favorite dick, shows him her daily masturbation routine, and releases her sexual desires by taking him to a guesthouse where she is forced to have a mixed bath. Now that her sadistic side has been awakened , Ito a reverse night-sneak attack on her uncle, and has sex with him wherever and whenever she wants, like an angel!