Ruri is a married woman living peacefully with her husband, but due to his exhaustion from work, he no longer satisfies her sexually, leaving her feeling lonely. When she starts caring for a young neighbor who caught a cold, their relationship unexpectedly turns intimate. While her husband is away on a business trip, she invites her lover into her home, and the two indulge in passionate affairs. Seeking to relieve her pent-up desires, she even involves a male college repeater, plunging into a lewd threesome with both men.