Katekyo Hitman Reborn! DS Ore ga Boss! Saikyou Family Taisen (家庭教師ヒットマンREBORN! DS オレがボス！最強ファミリー大戦), often simply shortened to "OreBoss" (オレボス), is a game for the Nintendo DS. The official site describes it as a "famiglia creation sim." You, as the player character, become the boss of a new mafia family, loosely follow the storyline of Reborn!, and fight/recruit a large number of the series' characters into your Family.