Newlywed Hikari is invited by her senior and telemarketing coworker Yumi to her first drinking party. That night, getting caught up in the alcohol, Yumi ends up clinging affectionately to Hikari, leading to an unexpected turn of events. The next day, concerned about Yumi who took a day off work, Hikari visits her to check on her. Before long, the two begin harboring feelings for each other, and whether at work or at home—during times when Hikari's husband is away—their love quietly grows.