Haruki Nakano experiences the ups and downs of high school life, living with his four mischievous sisters while their mother is away. From sharing a bed with his oldest sister who dozes off easily, to enduring the antics of his younger siblings who enjoy teasing him, Haruki navigates a household filled with laughter, arguments, and unexpected challenges. Grocery runs, movie nights, and even practicing kisses keep the household bustling with energy, ensuring that life in Danchigai is always eventful for Haruki and his sisters.