He transmigrated, and lost his memories.
But that was all right. Van Er still had the power of the Mimic Tear. He could copy the abilities and equipment of anyone who saw him as a companion, or anyone he killed. He could even copy their appearance and memories, and strengthen their abilities tenfold.
Whether it was a savior of the wicked with the power to stop time, the oldest of kings, a monster who was the embodiment of an atomic bomb, or even a superman who could lift a mountain with his bare hands, Van Er could copy them all.
And yet, Van Er still seemed to be fleeing from something, constantly chasing greater power.
A crossover. The first world: Demon Slayer