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Haruka Minami, a reliable high school student, manages the household for her two younger sisters, Kana and Chiaki, after their parents' absence. Kana, a lively middle schooler, often stirs up chaos with her impulsive antics, dragging others into her schemes. Chiaki, the sharp-tongued elementary schooler, asserts her intelligence while secretly admiring Haruka. The sisters navigate daily life with their friends, like Kana’s goofy classmate Fujioka and Chiaki’s soft-spoken friend Uchida, through school events and home mishaps. Their interactions, filled with banter and warmth, highlight their close bond amidst everyday challenges.