Toma Godo is considered incompetent because he has not been able to use magic since he was a child. He was sacrificed to the [Extreme Demon Island], where ferocious demons were raging, and there he met a [Demigod] who had mastered the art of combat! After being accepted by the [Demigod] as a disciple, Touma awakened his extraordinary talent, practiced martial arts day and night, destroyed all kinds of demons on the island, and finally evolved into an invincible person in the world. One day, a mysterious girl drifts to the island, completely changing Touma's fate. Touma left [Extreme Demon Island] with a beautiful girl calling herself Lise, but... Touma vowed to "protect" Lise, who holds a secret that affects the survival of humanity, and will now be freed. the whole world knows!