My Little Monster is a heartwarming age gap romance manga that follows the story of Shizuku Mizutani, a studious high school girl who prioritizes her academic success over socializing. However, her life takes an unexpected turn when she meets Haru Yoshida, a troublemaker who is feared by everyone in school. Despite their contrasting personalities, Shizuku and Haru form an unlikely friendship that gradually develops into a sweet romance. My Little Monster explores themes of personal growth, friendship, and the transformative power of love.