The story takes place in Kurashiki, Okayama Prefecture, where high school girl Morikawa Kokoro (voiced by Mitsuki Takahata) and her father Momotaro (voiced by Yosuke Eguchi) depend on each other for life. Kokoro is best at sleeping. No matter where she is, she seems to be able to fall asleep at any time as long as she wants. However, sleeping has been a bit annoying for Kokoro recently, because she always has the same dream over and over again. And her father seems to be only interested in modifying cars, and has no idea of his daughter's troubles at all. In 2020, just three days before the Tokyo Olympics, Momotaro was suddenly arrested by the police. Kokoro firmly believes that her father is absolutely innocent, so she finds her childhood friend, Morio Sado (voiced by Shinnosuke Manshima), who is in college, and goes to Tokyo to save her father. Along the way, the girl constantly gets inspiration from her dreams, and these are precisely the mysteries to solve the mystery of her father's arrest. Therefore, Kokoro decided to use her sleeping skills to complete this adventure that is intertwined with dreams and reality...