Through a strange turn of events, Tsubasa ends up in a hotel with Sakura, a handsome man she has just met at a mixer. She discovers that despite his cool, aloof demeanor, he is actually a virgin. That gap between his cold exterior and his innocent, flustered reactions excites her, and she takes the lead in the encounter. They fail to exchange contact information, and Tsubasa assumes she will never see him again. The next day, however, she visits a dentist for a checkup and finds that the dentist assigned to treat her is none other than Sakura himself.

Sakura, whose full surname is likely Sakura (given name rarely revealed in summaries), works at a dental clinic. He is a quiet, seemingly domineering man who is actually shy and inexperienced with women. Tsubasa is a confident, proactive young woman who works in an office and cares deeply about her close friend Natsuki. Their relationship begins as a secret arrangement limited to after-treatment encounters in the clinic, with Tsubasa pushing the boundaries while Sakura gradually opens up and becomes deeply enamored.

The story follows several narrative arcs. The first arc sets up their secret physical relationship as Tsubasa's dental treatment progresses. The second major arc introduces a conflict when Natsuki confesses that she is in love with Tsubasa, forcing Tsubasa to question her own feelings and her friendship. Tsubasa decides to keep her distance from Sakura while she sorts things out, causing both of them pain. Eventually, with Natsuki's encouragement, Tsubasa realizes she truly loves Sakura and they begin a proper romantic relationship.

The third arc involves meeting Sakura's family, particularly his strict mother Eiko, who comes from a respected dental lineage and initially disapproves of Tsubasa. The couple overcomes this opposition through Tsubasa's persistence and Sakura's quiet determination. The story culminates in a wedding and a happy ending. An additional side story later in the series covers how Sakura's parents, Eiko and Shuichi, met through an arranged marriage and gradually fell in love. The main series is complete, with the central romance resolving into marriage.