Nanami has been married to a colleague for almost a year and is living a happy married life. Then, due to personnel changes, a new section manager, Ono, is assigned to her department. Ono and Nanami had a relationship only once before their marriage. Although they felt awkward about that, they continued to work without touching on their past. One day, a mistake was made in a document that Nanami had prepared, and Ono and Nanami had to work on a holiday. Ono makes advances to Nanami in the empty office. Feeling guilty about having caused trouble, Nanami is unable to strongly refuse, and the two cross the line again.