Shy girl Bocchi Hitori ends up starting her new middle school all alone after her only friend, Kai Yawara, vows to break off their friendship until Bocchi makes friends with everyone in her class. After a failed attempt at abolishing class and a self-introduction that ends in disaster, Bocchi speaks with her neighboring classmate, Nako Sunao, who takes a liking to her despite some initial misunderstandings. As the two chat and exchange texts with each other, Nako officially becomes Bocchi's first new friend.