Mitsunori is married to Takako, a junior from his university club, and lives a very ordinary life. One day, Takako's friend Ayumi, who was in the same club, comes to stay the night. Mitsunori has always liked Ayumi, and he can't contain his excitement. "I wish Ayumi was my wife..." Mitsunori indulges in a selfish fantasy. Then, one night, a dream-like big opportunity suddenly arrives! The train stops, and his wife Takako can't come home...