The future of the future

In a quiet corner of Tokyo, there lives a happy family of three. Now, this family has welcomed a new life. Xiaojun, a coquettish son, welcomed a newborn sister. He felt that his parents' love for him was taken away by his sister. When he was angry, Xiaojun met his sister from the "future" in the courtyard and started a journey through time. In the time and space of the family tree, he and his "future" sister met his childhood mother, his great-grandfather in his youth, and even his future self. During the adventure, Xiaojun realized different forms of "family love."