Kirari is a girl who grew up in Tokyo and was cared for in a warm home. This summer, she went back to her paternal parents' house for Obon. One day, Kirari witnesses her uncle sleeping on the veranda with an erection. Curious, Kirari takes off his trousers, touches him directly, and Kokoro strokes him until he ejaculates. Before she knows it, her uncle has woken up and noticed. Since then, word has spread among her uncles that "Kirari is a naughty girl," and Kirari becomes the target of middle-aged men...