The Ayumi which lived in the apartment with a husband had dissatisfaction in the life with a selfish husband. On such one day, hit young man, Suzuki who moved in to the neighbor, and have dropped a key. Two people fall in love at first sight each other then. The Ayumi not to be able to say drops a key with the mouth on purpose, and be going to deepen relations with Suzuki. And two people become the close relation….