Asian sisters Nono and Momoka, both amateurs in front of the camera, find themselves in a monthly predicament. As the new moon approaches, their desires intensify, driving them to satisfy their urges in secret. This time, they're caught in the act by their younger sister, who films their intimate moment. Nono, the elder, can't help but pleasure herself, her fingers dancing on her clit, while Momoka watches, her own desire growing. They try to resist, but the monthly pull is strong, and their bodies betray them, leading to a heated, taboo encounter.