First Love Monster
初恋モンスター
When fifteen-year-old Kaho Nikaidou leaves her sheltered home to start a new life in a Tokyo high school dormitory, the last thing she expects is to nearly get hit by a truck. Saved at the last moment by a handsome stranger, Kaho falls for him instantly, and after finally tracking him down, she boldly confesses her feelings. It turns out her mystery savior, Kanade, is the son of her new landlord. The handsome object of Kaho's affection agrees to go out with her, but her newfound bliss is short-lived when it turns out that her new boyfriend is a fifth-grader.
