Naho, an eleven‑year‑old girl, lives with her father and her two‑year‑old brother Jun. After her mother died during childbirth, Naho has taken on the responsibility of caring for Jun at home. Understandably, the burden frustrates her, as a girl her age would love to play with friends rather than focus on her duties. One day, a strange man in a long coat, carrying a large suitcase, appears before her. He introduces himself as Kotaro, the Dreamball Dealer, and offers to take Naho to a dreamland where her everyday troubles can be left behind. Following this encounter, odd phenomena begin to unfold in Naho’s life. Suddenly, she finds herself enjoying time with her friends again, while the mystery of Kotaro’s promise deepens.