Too Many Losing Heroines! centers on Kazuhiko Nukumizu, a first-year high school student who would rather stay on the sidelines than get caught up in the emotional chaos of teenage romance. His quiet routine changes when he witnesses Anna Yanami, a popular classmate, being rejected by her childhood friend. Instead of putting on a brave face and enduring the humiliation alone, Anna unexpectedly turns to Nukumizu for comfort, dragging him into an awkward new role as the person who hears other people's heartbreak.
That one incident opens the door to a series of similar encounters, and Nukumizu soon finds himself drawn into the private disappointments of the girls around him. Lemon Yakishio, an energetic member of the track club, and Chika Komari, a shy girl from the literature club, are each carrying their own romantic letdowns. What follows is a character-driven romantic comedy about unrequited feelings, wounded pride, and the strange bonds that form when rejected girls find someone willing to listen. Rather than treating heartbreak as a simple punchline, Too Many Losing Heroines! builds its charm from small gestures, awkward conversations, and the way Nukumizu's calm school life slowly becomes entangled with the emotional lives of Anna, Lemon, and Chika.