Yōta Yorina enters a high school that has recently transitioned from an all-boys institution to a co-ed one. On his first day, he discovers he has been placed in a science class with only one female student, Suzu Nonogaki. While initially curious about her, Yōta finds himself intimidated by Suzu’s cold and hostile attitude toward the male students. However, he soon uncovers the truth behind her behavior: Suzu suffers from a severe aversion to men, so intense that she breaks into tears from merely making eye contact with a boy. Despite this overwhelming fear, Suzu genuinely wishes to overcome her phobia and make friends with her male classmates. Moved by her difficult situation but sincere desire for connection, Yōta decides to help her, setting the stage for a unique relationship as they work together to build her friendships one careful step at a time. The story unfolds in a classroom and school environment that is gradually adapting to its new co-ed status, focusing on the awkward but heartwarming attempts of Suzu to socialize with the boys, with Yōta acting as her primary supporter through a series of comedic and sensitive situations.