Nobuaki acts always trying to help others, was the first to try to end the game finding Ousama, always doing everything to help his best friend and his girlfriend. Nobuaki's the only survivor and he later ends up participating in more Ousama Games to avenge his friends and catch the person who made the game. Nobuaki somehow carried the DNA of infected genes that spread this infected action like getting people get torn in pieces. That's why he's the only one who survived in the game. Nobuaki died by his throat getting cut and loss of blood in the sequel by the female antagonist who also died by getting slashed at the back with the particular jigsaw.