Thanks to the Fruit of Evolution, Seiichi Hiiragi has a new life in a parallel realm where he discovers trustworthy allies and develops potent spells. His remarkable abilities draw the attention of Barbador Academy of Magic's headmaster, Barnabus Ablitt, who invites him to teach. As fate would have it, Seiichi's former classmates from Earth are also enrolled, leading to an awkward reunion. Amidst all this, The Great Devil Order, a mysterious cult, is plotting to revive their deity by sacrificing the students of Barbador. With Seiichi's unparalleled strength, he assumes the task of safeguarding his comrades and protecting the world from the approaching darkness.