In a time when the great war between five rival races for supremacy on Earth ended with humanity’s victory led by the hero Sid, the world suddenly gets “overwritten” right before the eyes of a boy named Kai. In this rewritten world, Kai witnesses humanity’s defeat in the war as a result of Sid’s absence—where dragons and demons now rule the land, and Kai himself has become a forgotten existence to all humans. However, after encountering the mysterious girl Rinne, Kai resolves to break free from this rewritten fate. In a world without a hero, he inherits the sword and martial skills of the hero (Sid) and challenges the powerful enemy races that dominate the land.

Plain, boring, and friendless Kazuhiko Nukumizu has witnessed something completely baffling: popular girl Anna Yanami was friend-zoned by her childhood friend and crush! In fact, all the popular girls around him are getting similarly rejected by the boys they like. Without realizing it, Kazuhiko becomes entangled in the relationship drama where all the leading heroines are losing out on love! Can he keep their spirits up and help them find happiness?