it's been four years since i got married... Taro and his wife Naoko were looking around for real estate in Tokyo with Naoko's mother, Seiko, to buy a home. Finally, he found a good property, but the price was high and Taro was annoyed. "Well, I'll pay you a down payment. Shall we live together?" According to Seiko's proposal, the Taro couple and Seika would live together with two families. And the same life with my wife's mother that started. In that life, there was a hapning hidden in which Taro had not expected ....