In My Girlfriend’s Naughty Sister, the protagonist wants to be close to his girlfriend, Himamari, but her older sister keeps interfering with playful overprotectiveness. Her teasing and unexpected behavior turn every encounter into a tense, thrilling game, leaving him caught between guilt and temptation. The story explores the sparks, mischief, and secret desires that arise from their forbidden interactions.Description: In My Girlfriend’s Naughty Sister, the protagonist wants to be close to his girlfriend, Himamari, but her older sister keeps interfering with playful overprotectiveness. Her teasing and unexpected behavior turn every encounter into a tense, thrilling game, leaving him caught between guilt and temptation. The story explores the sparks, mischief, and secret desires that arise from their forbidden interactions.