The Demon God Needs No System to be The Strongest

Asa was an average person with dreams; to enroll in a prestigious university, finding a girlfriend, and spending the rest of his life with her. The unfortunate thing was, he tragically passed away at the age of 20, but when he opened his eyes again, he was in a place called Hell. A location where demons reside! If he wants to survive, he must slay every demon he encounters. There was no food or water. The only food is your enemy, and water is their blood. He lived through Hell for 2 million years before he could open the Seal and finally return to the Earth and eat his favorite food— Rice. And to see another human… While he was trying to return to Earth, he was attacked by an unknown being who identified himself as Chad. Asa who almost used up his energy got his powers sealed by Chad. [You are a threat] [You are not allowed out ] [It is impossible to kill you] [Chad Hates you] [Sealing your Demonic Energy] Asa, who got his powers sealed, landed in a place made by the System! A place where everyone has a system and everyone is the hero of the world. While he was the only non-system person and the weakest?