After Kanna's mother Yayoi, who shared her love of running, passes away, Kanna is left with a heavy heart. However, her life takes a surprising turn when she stumbles upon a remarkable discovery about her mother. One day, Kanna has an unexpected encounter with her beloved rabbit Shiro and a mischievous demon boy named Yasha, who reveal a stunning truth to her: Yayoi was an "Idaten" - a descendant of the gods gifted with incredible speed and dedicated to bringing offerings to the Kamiari Festival in Izumo. As the new possessor of the Idaten amulet and Yayoi's daughter, Kanna is tasked with continuing this duty, lest the country suffer dire consequences. Lured by the chance to reunite with her mother at the festival, Kanna accepts the challenge and enlists the help of Shiro and Yasha. However, as she embarks on this journey, Kanna quickly realizes there is more to this race than meets the eye. Not only will it put her physical abilities to the test, but it will also test the strength of her heart.