Why am I snoozing all the time?

I keep having this dream...

Kokone Morikawa lives with her father in Okayama Prefecture. She's a typical high school senior with no special talents except one: she can fall asleep anytime, anywhere. Recently she's been having a series of strange dreams. Her father Momotaro, a gruff man of few words, doesn't seem to pay much attention to his daughter; he spends most of his time repairing and modifying cars.
The year is 2020, three days before the opening of the Tokyo Olympics. Without warning, Momotaro is arrested and taken to far-off Tokyo for questioning. He's a misfit, but Kokone can't believe that he would really do anything bad. With help from college student and childhood friend Morio, Kokone is determined to make her way to Tokyo and free her father, as well as unravel the mystery of her dreams. Along the way, she discovers that those dreams are the key to facing her challenges in the real world.
Kokone uses her only talent--napping--to embark on a mysterious journey that straddles dreams and reality. And waiting for her at the end of her adventure is a small but precious truth...

和父亲两个人一起住在冈山县的森川心羽，是个平凡普通的高中女生，唯一的过人之处就是"午睡"。这样的她，近来不知为何，总是不断梦见相同的奇妙场景。心羽的父亲性格沉默寡言，整天埋头于改装汽车，似乎对于女儿老是在大白天经历奇异梦境的事毫无所知。

2020年，东京奥运会开幕的3天前，父亲突然被警察逮捕到了东京。虽然父亲沉默寡言，但心羽难以相信自己的父亲会做违法的坏事。为了解决不断出现的悬疑谜团，心羽决意与青梅竹马的大学生守男前往东京。一路上，她发现了自己平时的白日梦境，居然是解决危机的关键。

用唯一擅长的"午睡"作为武器，心羽踏上了跨越梦境与现实的神奇之旅。在这段冒险旅程的最后，她发现的小而珍贵的真理是......