Sei is an accountant that helped the Takashiro family keep their assets in place. He always has his way with the older twin of the Takashiro family, Mizuha. Mizuha has zero resistance against the flaming passion that emanates from Sei. Will they open their hearts to each other? The other twin, Yuuya, has been fending off perverts who are interested in Mizuha. But is his classmate, Tsuzuki, interested in Mizuha or in Yuuya? What will happen to Yuuya's unrequited love for Tsuzuki?