In a fantastical realm where gods and humans coexist, a traditional rite is set to take place after 60 years to inaugurate the new ruling princess. However, due to a shortage of female heirs in the Hime Clan, a boy named Arata must take her place. In modern-day Japan, another boy bearing the name Arata Hinohara begins his new life in high school, hoping to leave behind his troubled past. But when he uncovers a mysterious connection to the original Arata, his plans for a fresh start are jeopardized. Framed for the murder of Princess Kikuri, Hinohara is banished to the prison island of Gatoya, where he must face the formidable warden Tsutsuga. Can Hinohara unleash the power of his Hayagami in time to secure his escape?