The protagonist, Tsukikage Yuu, lost his parents in an accident at a young age. One day, a mysterious voice reveals to him that their deaths were no accident—they were deliberately orchestrated. Consumed by a desire for power, Yuu strays from the right path and seemingly falls at the hands of his adoptive father’s deadly blade… However, instead of death, he finds himself forced into another world by an entity calling itself the Mixed God. Now, accompanied by the enigmatic voice known as “Apocalypse” and the cursed blade Ame-no-Murakumo-no-Tsurugi, which had once pierced his own body, Yuu embarks on a journey through a world of swords and magic.