Sato Itto is an ordinary salaryman who has been shy about love ever since a painful experience in his past. His quiet life takes a dramatic turn when he attends a class reunion for the first time in years. While reconnecting with old friends, he is shocked to see Hebo, his first love from school days, who has since become a popular idol now on hiatus. Overwhelmed by seeing her again, Sato drinks heavily despite normally avoiding alcohol. When he wakes up the next morning, he finds himself and Hebo naked together in the same bed with no memory of what happened. Before he can even process the situation, Hebo drops a shocking demand: Marry me.

The story follows this unlikely pair as they navigate a sudden marriage proposal born from a drunken, mysterious encounter. Neither has any real experience with love, making their relationship both awkward and tender. Sato, still haunted by his romantic trauma, must learn to open up, while Hebo navigates leaving her idol career behind to build a new life as a wife. The series combines romantic comedy with the challenges of two emotionally inexperienced people trying to form a genuine connection.

Key events include Sato and Hebo taking a pre-wedding trip to deepen their bond before officially marrying, where they grow closer while enjoying each others company. However, complications arise when a mysterious person shows up at Hebos doorstep, threatening to disrupt their developing relationship. The appearance of Kumomo, a former idol from Hebos past, also creates tension that Sato must help resolve.

The manga portrays the daily life of this newlywed couple as they figure out what marriage means for two people who skipped all the usual steps of dating and falling in love, all while dealing with the lingering complications of Hebos former celebrity status and the secret she seems to be keeping about what really happened the night of the reunion.