In a city plagued by a serial arsonist, Haru, a cheerful and carefree young man, grapples with his uncontrollable power. When falsely accused of being the arsonist, his ability erupts, accidentally injuring his friend and girlfriend, Natsu, leaving her severely wounded. Determined to stand by Haru's side, Natsu survives the ordeal and vows to shield him from the challenges posed by his dangerous gift.