Theo Moretti's theory is real: after death, the brain creates a near-infinite illusion based on one's beliefs. He chooses to be isekai'd into a "realistic" fantasy world, determined to succeed on his own merit without any cheats.

But after a swift and pathetic death, he chooses his only secret power: resurrection, just so he can continue exploring that world.

Now, the shy and powerless teen navigates this dangerous new life, joining the dysfunctional Suicider group, Grimwerod. He uses his only true powers, his knowledge and secret immortality to survive deadly threats and earn his place among his new companions, while struggling to accept the terrifying truth: the first friends of his entire life are just a fabrication of his own mind, an illusion he is deeply immersed in.