In the midst of raising their child and managing a home-based nail salon, Azu, a 30-year-old stay-at-home mom, grapples with doubts about her husband Junpei's feelings. A seemingly mundane day at the salon takes a drastic turn when a customer shares a seductive secret with her. Soon, a mysterious message disrupts their relationship, plunging them into turmoil. Yukari Koyama presents a gripping tale of temptation, infidelity, and shattered love in this compelling narrative about four married individuals facing a challenging ordeal.