In the aftermath of 'Okawari,' a year elapses, marking the growth of the three sisters. Despite their similarities in preferences and quirks, Haruka, the eldest, embodies a nurturing motherly figure with a penchant for rules, while Kana, the middle child, thrives on last-minute chaos, often stirring up trouble for the trio. Chiaki, the youngest, exudes a calculating and attention-seeking persona, craving admiration from Haruka and adding woes to the hapless Kana. Though their dynamics seem askew, their love for each other remains unwavering. Amidst the humor, trials, and affection that define their daily lives, the family faces new challenges as Haruka transitions into young adulthood, bearing more responsibilities as she navigates adult life while looking after her younger siblings.