he who knows nothing but a will to survive to remember just where is he and why all but a questions that answer's he failed to find.
the story follows a guy on the verge of death who swear to avenge an unknown person in a glass tank before he died system transports him into Leon body and now he doesn't remember anything not even his original name they tell him to pass the test if he wants to live
So why just why did he do in his life to get the role of a villain they didn't even bother giving him an embodiment