There's a young couple, Haruka and Kenji. One day, Haruka gets disappointed in Kenji, and runs away with their son, Takuya. They forward to Kenji's friend, Mitsuru's house. Yet, Haruka asks her mother, Kiyoko to take care of Takuya, and starts her job hunting, since she can't get along with Mitsuru. On the other hand, there is another young couple, Takuma and Kana. Even though, they look happily married for two years, Takuma hides a secret from Kana. One day, Takuma's co-worker, Akita comes to Takuma's house. Akita suddenly tells one secret to Kana while Takuma is not around. Shocked Kana attempts to reveal the secret on Takuma's way home.
