Riegel inherits the Dimensional Magic Cube—an artifact capable of harvesting dimensional energy, converting power across worlds, and storing vast treasures. Once monthly, it tears open portals to alternate realities, granting him passage between infinite dimensions. Stripped of choice in his past life, Riegel vows to seize control of his destiny. Armed with the Dimensional Magic Cube, he ventures into a sword-and-magic realm, traversing countless dimensions in search of strength and redemption across worlds. From the depths of Danmachi's dungeons to the demon-slayer battlefields of Kimetsu no Yaiba, Riegel shatters dimensional boundaries and explores anime worlds transformed into living realities. Each journey forges him stronger, drawing powerful allies into an expanding harem as he reshapes his fate through adventure, combat, and endless discovery across the multiverse.