Haru is a carefree, amiable guy with an uncontrollable power. In the city where he resides, a recurring issue is the presence of a serial arsonist. When falsely accused of being the culprit, Haru's ability abruptly ignites, leaving his friend and girlfriend Natsu severely burned. Despite her injuries, Natsu pledges to support and assist Haru as he grapples with the challenges of wielding his ability.