Shota was raised by his father and grandmother from an early age. His family home is a two-family home on the top floor of an apartment building that his mother and grandfather bought before they died in a traffic accident. After his grandmother passed away last year, Shota and his father lived in the spacious apartment together. His father plans to turn the spare room into a shared house, and Natsu, a female college student who will be moving into a university in Tokyo in the new academic year, becomes the first tenant. However, Shota suddenly finds himself living together with Natsu, who has a slender figure but a bulging, pervy ass. The boy, who is an ass-loving man, plays naughty pranks all over the house, and they end up having sex...