Shiunji-ke no Kodomotachi

A family of two brothers and five sisters, all possessing notable intelligence and beauty, attract public attention due to their privileged background. The eldest son, Arata, has endured the playful and unpredictable behavior of his sisters, yet remains devoted to them. When the youngest sister reaches fifteen, the father unveils a long-concealed truth about the Shiunji siblings, disrupting Arata's perception of his family.