Charismatic college student Rou never expected his one-night stand with thirty-year-old Yoshino to turn into anything more than a casual fling, but the two have since settled into a blissful relationship and a shared daily life. Now a sequel to their original story, the narrative follows the couple as they navigate a major life transition: Rou has graduated from university and entered the workforce. Looking forward to a happy future together, Rou finds the reality of being a working adult frustrating, as it leaves him with significantly less time to spend with Yoshino.

The conflict deepens when Rou starts his new job and clashes with a colleague named Niko. As both he and Yoshino adjust to their demanding schedules, Yoshino grows anxious, suspecting that there might be more going on between Rou and his new coworker than Rou is letting on. This insecurity and the growing distance between them threaten to tear their relationship apart. The story focuses on the drama and passion that arise as the formerly carefree college student and the older, less experienced Yoshino fight to protect their love from the pressures of adult life and the specter of jealousy.