Mayu, a beautiful and kind office idol, was worried about her cold marriage. Kazuya, a colleague, has a crush on Mayu. Worried about Mayu's lack of energy, he invites her out to cheer her up. At first, he was just trying to spite her husband, who doesn't care about her. However, touched by Kazuya's sincere love, Mayu gradually opens up to Kokoro... and crosses the line that should never be crossed.