A receptionist named Yukino, known around the office as a timid and quiet beauty, is secretly still hung up on her unforgettable first love from high school. Just as she has nearly given up on ever finding that feeling again, she has a chance reunion with her ex-boyfriend, Haru, who has grown into a handsome and ambitious salesman at her own company. Unlike the bitter or traumatic breakups often seen in stories, their relationship simply dissolved after a few weeks back then due to Yukino’s overwhelming feelings of insecurity and inferiority.

The story takes place in a contemporary Japanese office setting, where Yukino works as a receptionist and Haru operates as a charismatic salesman. Recognizing that Yukino is still shy and lacking in self-confidence, Haru begins to pursue her wholeheartedly and proposes a trial relationship to help her ease into the idea of dating again, though Yukino secretly wishes for a real commitment from the start. As they begin going on dates and growing closer, Haru is portrayed as a gentleman who refuses to take things too far physically until Yukino explicitly states she is ready, focusing on helping her come out of her shell.

The primary narrative arc follows Yukino’s gradual journey from low self-esteem to assertiveness. Despite their chemistry being obvious to everyone around them, the pair struggles to openly confess their lingering feelings, leading to a period where they act as a couple while dancing around the truth of their emotions. The story avoids typical melodrama involving cheating or anger, instead presenting a wholesome and nurturing dynamic where two people who never stopped liking each other get a second chance at love as adults who have matured and changed over time.