The story is set in a world in which humanity triumphed over other races in a war for hegemony. However, this is rewritten with a new reality where humanity lost the war of the five races, and its hero Sid is nowhere to be found. Only a young boy named Kai is aware of this change, and other humans seem to have forgotten his existence. After meeting the mysterious Rinne, Kai resolves to go against humanity's altered fate.
Kai's duty as a member of the Human Protection Agency is to ensure that the four races from The Great War are kept sealed in their graveyards. Humanity has been at peace for 100 years, until one day a portal opens and the world he's known ceases to exist.
In the graveyard where the demons were entombed in his world, Kai finds a girl whom he cannot identify as any of the known races. When she asks him for help, he doesn't hesitate for long. After freeing her from her chains, mysterious things happen again.
After the demon attack on Neo Vishal, the resistance launches a major offensive against the demons and their heroine with the help of Kai and Rinne. But will Kai's knowledge from his world and Rinne's powers be enough to defeat the demons?
While Kai and Rinne confront the heroine of the demons, one of those mysterious beings reappears and tries to remove Vanessa from the world. However, Vanessa manages to fight it off. She then turns her attention back to Kai and Rinne.
After finally driving the demons out of the capital, Urza's resistance sets out for the Federation of Io, whose resistance has requested support against the divine beings. However, it quickly becomes clear that not everyone welcomes this support.
Jeanne and Urza's resistance encounter remnants of the Io resistance in the Elfan Forest. Following the trail, they arrive at the Elf Village, where the leader of the elves is already waiting to present them with a proposal.
Urza's resistance, along with Reiren, confronts the Lord of the Heavens, Alfreya, who is attempting to subjugate the divine beings. However, Alfreya appears to possess powers that surpass even those of a hero.
Once again, a Last Riser seems to be connected to the sudden change in a hero's nature. Will Kai and his companions be able to defeat Alfreya? And what impact will this have on the relationship between humans and the divine beings?
The spirit hero, "Spirit Sovereign Rikugen Kyoko" and the mythical beast hero, "Fang King Rath=IE" face off, with the fate of their races in the balance. Meanwhile, Kai and his companions head south to the Yulun Federation.
The resistance gets into a battle against the heroine of the spirit beings, but in the midst of it, a Last Riser appears. After the battle, they decide to get to the bottom of the mystery of the Last Risers. And so they proceed to the next tomb.
A battle begins between Last Riser and Kai with Kyoko's aid. Rinne, frozen out of fear, recalls her past with Sid. They manage to lure the monster out of the graveyard as all the races join forces to defeat one enemy; The enemy of the world, Last Riser.
Complete episode guide for Why Nobody Remembers My World? with detailed information about every season and episode including air dates, summaries, ratings, and streaming availability in Brazil.
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