Immortal System in Fantasy World
Every year, Roland is buried alive by his grandfather. Thanks to that, he learns how to survive being buried alive for days.
Many years later, Roland Isekai came to the Fantasy world with five other people, but the other five were all heroes, while he did not have any magical talent.
Roland thought he would be an ordinary person for the rest of his life, but his fiancée, because she loved one of the five heroes, cut off his limbs and buried him alive.
Luckily… he didn't die, on the contrary, he was able to activate the 'Immortal System'.
It doesn't matter if he's an ordinary person, as long as he dies more, he becomes stronger.
Roland, crawling out of hell, returns to take revenge on his fiancée.
At the same time, he also became the devil of this world, confronting the heroes.