Mana, a young innkeeper, runs a small restaurant with her husband and leads a busy yet happy life. However, one day, a regular customer suddenly makes advances toward her, forcing her into a relationship. Initially filled with disgust and confusion, she gradually finds herself shaken by the pleasure she hasn't felt in years, drawn step by step into forbidden desire. Enthralled by the affair, Mana begins secretly satisfying her hidden cravings on nights when her husband is away. But eventually, the secret reaches her husband's ears, creating a new rift between the couple.