Seiya Aonami

The "Otherworld" refers to countless parallel dimensions that exist somewhere beyond our own reality. In an ambitious effort to observe and explore these unknown realms, authorities have selected a highly unconventional candidate for the mission: Prisoner X, a death row inmate currently awaiting execution. Armed with nothing but an invisible lifeline as his sole tether to the world he leaves behind, Prisoner X is thrust into the depths of the Otherworld. He serves as a living probe, dispatched on a perilous journey into uncharted parallel dimensions where survival is far from guaranteed. His desperate plunge into the unknown marks the beginning of a harrowing expedition across realities.