Five years have passed since she joined a stationery manufacturer as a new graduate. Due to the recent social situation, the company's management has deteriorated, and there are rumors of the company being bought out... and then her boyfriend proposes marriage. Mahiro, who comes from a single-parent family, is torn between her desire to get married quickly to reassure her mother, and her own feelings of not being able to take the plunge. Meanwhile, her colleague Atsushi returns to the company during overtime. The two of them drink together for the first time in a while, reminiscing about their time at the company...