Hiroshi Houshou's life as a high school student is unexpectedly and dramatically reshaped by his mother's death. This loss triggers the sudden reappearance of his long-absent father. His father's return introduces Hiroshi to two new family members: his father's new wife, a prominent actress, and her daughter, Rina Yuuki, a celebrated and beautiful idol singer. The arrival of these figures forces a pivotal shift in Hiroshi's family structure and his everyday existence.