“Solitude” — the deadliest prison in the universe, Karaismán.
Its structure changes daily, and thousands die within its walls every single day.
Yet, there is one infamous inmate who has survived for 64 years: Argel Lastos.

Though officially ranked as nothing more than a Class-1, Argel has always emerged victorious — no matter who he fights, regardless of their level.
He survives through strategy, combat prowess, loyal allies, and knowledge.

To maintain his aging, frail body, Argel made a contract with Karaismán’s creators — the very ones who designed “Solitude.”
In return, they assign him a mission: to protect a “product” of great value.

This time, that “product” is a blond-haired boy…

Thus begins an intense and overwhelming tale — a dark sci-fi fantasy action story starring the universe’s strongest old man.