Yuu, son of the late actress Subaru Ayase, faces immense pressure at Saika Academy, a prestigious school known for nurturing talents. Despite lacking his mother's gifts, Yuu is determined to fulfill her final wish of creating a happy family. Taken in by Subaru's friend, who happens to be the father of the three prodigious Mikadono sisters at the academy, Yuu endeavors to bridge the gap between them. While the sisters initially focus solely on their talents, Yuu's compassion gradually melts their barriers, rekindling the familial bond they once shared.