Tsubomi, a newly married young wife, was living happily with her husband. One day, a man moved into the old apartment next door. It was Kudo, her homeroom teacher whom Tsubomi had admired since her school days. The next day, Tsubomi reunited with Kudo in front of the apartment and, unable to refuse, ended up having a relationship with him. Her feelings were torn between her beloved husband and the man she had admired... Tsubomi's conflict began.