Nina throws herself into her work as if to escape from her troubled married life. If she returns home, the cold war with her husband will begin again. She doesn't want to go home... but her co-worker Kazuya stops her. Worried about Nina's lack of energy, he offers to treat her to a special cup of coffee. Someone who cares about her. Nina is happy just knowing that, but then he confesses his feelings to her... She discovers the joy of being loved as a woman by her wife and becomes addicted to the immoral pleasure of betrayal.