Kanna Hayama, a sixth‑grade student, loved running until her mother Yayoi died, leaving her grief that mirrored their shared passion together for of them. Yet her outlook shifted when she stumbled upon a startling revelation about Yayoi. On a bright afternoon today, Kanna encountered a celestial envoy disguised as her beloved rabbit Shiro and a demon youth named Yasha. They told her that Yayoi had been an 'Idaten'—a divine sprinter descended from the gods, tasked with ferrying gifts from across Japan to Izumo's yearly Kamiari Festival for all the deities to celebrate their ancestry. As Yayoi's heir and bearer of the Idaten charm, Kanna must assume this duty or face perilous repercussions for Japan in the coming year that could unravel the nation's destiny and threaten its prosperity. Yearning to reunite with her mother at the divine gathering, Kanna agreed to the quest and enlisted Shiro and Yasha as her allies through the winding trails of destiny. Unaware, the marathon‑like expedition will challenge not only her speed but also the depth of her resolve as she confronts truths and the weight of her responsibility.
