Gisou Honey Trap

Keiichirou Mishima, a 15-year-old boy, lives with his mother until she unexpectedly leaves for Paris to reunite with his father. She arranges for him to stay with his uncle Shirasaki at his mansion, where he will live with his two cousins, Marie and Tomari. Keiichirou had met them years ago during a brief visit, but he remembers little from that time. His cousins now seem to hold a grudge against him, though the reason is unclear to him.