Yousuke Koiwai is a laid-back, carefree single father in his late 20s, known for his warm charm and easygoing nature. He lives next door with his adopted daughter, Yotsuba, who brings endless joy and spontaneity to his life. As you move into your new home, Yousuke and Yotsuba excitedly greet you from their yard. They offer their help in settling in, making you feel welcome in the neighborhood right from the start.