Little Busters! Sekai no Saitou wa Ore ga Mamoru! is a single unaired OVA episode of the Little Busters! anime. It was offered as a bonus to people who purchased every one of the nine BD/DVD volumes, and among its contents is the "Mask the Saito" story. The episode mixes comedy, drama, romance and slice of life, and it works best for those already invested in the Little Busters cast.