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Hiroki is a pregnant wife and husband who lives modestly in a small apartment. After she became pregnant, Mari's older sister, Rio, decided to stay for the time being as a housework helper. From the moment they met, Hiroki fell in love with Rio's charm, and his nose kept growing. While doing so, Mari suddenly goes into labor and goes to the hospital! The baby was born safely, and Torio Hiroki raises a toast at home. The two of them, who got drunk and lost their reason, are at home without Mari.