Married for 15 years, Miki is content with her stable, dual-income life alongside her kind and considerate husband. However, his strict habit of always using condoms begins to unsettle her. While she craves the intimate sensation of bare skin, the thick condoms he chooses leave her feeling disconnected and unfulfilled. This growing frustration reaches its breaking point when her husband goes on a business trip. On impulse, Miki downloads a dating app—only to find her colleague's husband on it. Despite initial awkwardness, they begin spending time together during their free hours, sharing drinks and conversation, which soon leads them to cross the line. Experiencing unprotected sex for the first time in years, Miki's long-suppressed desires are unleashed, pulling her into a whirlwind of new, overwhelming emotions.