A lonely sixth-grader named Miyabi Mifu has spent her entire life in a childrens home, believing she has no parents or relatives. Her world is turned upside down when she discovers she is actually a quadruplet. She is brought together with her three identical sisters, Ichika, Nitori, and Shizuki, to live under one roof as part of a national program that houses children in similar circumstances. The story follows the four girls as they navigate their new shared life, dealing with the chaos that comes from living together for the first time. Despite their identical faces and voices, each sister has a distinct personality shaped by being raised separately in different environments, leading to both heartwarming connections and unexpected misunderstandings. The narrative includes arcs where the sisters confront everyday challenges like school life, such as when Ichika struggles with joining the basketball club due to pressure from older students or when a pendant precious to all four is stolen during a school festival, forcing them to work together to retrieve it. An ongoing mystery also emerges with the appearance of a woman claiming to be the quadruplets mother, adding a deeper layer of conflict to their journey of forming a new family.