Her husband was kind at the beginning of their marriage, but before long their relationship had cooled... Suzu went on a trip to a hot spring in an attempt to somehow repair their relationship. However, her husband was always working and neglected her... While spending her time alone on the trip, Suzu was Kokoro by her encounter with a man named Koyama, whom she happened to meet in the midst of despair. She was troubled by the regret of having been carried away and having sex with him, but her body quietly trembled with heat from the pleasure she had never felt with her husband...