Rock'n Game Boy is a Japanese manga by Shigeto Ikehara serialized in Comic BomBom from October 1989 to December 1991 and later released in 5 tankōbon volumes. Contra is one of the video games featured in the manga.
The story follows Hajime Nanba and his friends, who form the Rock'n Gamers. Hajime and his older brother Shō are skilled video game players. When Shō becomes a famous gamer, he becomes the target of the secret evil organization known as BUG, which plans to conquer the world using the technology of the Nintendo Game Boy. BUG has agents worldwide, and they will do anything to achieve their goal, including kidnapped children and turn them into members with mind control. Hajime's brother suddenly disappeared one day, and he tries to discover his whereabouts, learning about the existence of the evil organization in his search. Hajime tries to rescue his brother and put an end to BUG with the help of other gamers.