Help finding manga

Ok there’s this manga about this high schooler who’s the the ceo of a big company after his parents died. Everybody loves the dude bc he’s nice and smart and stuff. Recently in the news big corporates have been giving their company to a mafia group for unknown reasons. The mafia group shows up at the high schooler’s company building and forced the ceo into playing a game for ownership of the company. They bet on that and each other’s lives and money I think. The game starts and apparently the mafia dude has a demon key that gives him a secret power. Stuff happens and the high schooler wins the game and the demon key. The mafia’s head boss gets killed. Other stuff happens. Idk if that was helpful or not but can u guys pls link or name any mangas that have all that happen in the story??