One year has passed since Okawari, and the three sisters have matured. Their interests and personalities remain similar to before. Haruka, the eldest, is a nurturing mother figure to her younger siblings, while also adhering to strict discipline. Kana, the middle child, tends to procrastinate and often causes trouble for the trio. Chiaki, the youngest, is cunning and seeks admiration and affection from Haruka, while teasing Kana. Despite the family's imbalanced dynamic, they love one another unconditionally. Their daily lives remain as entertaining as ever, with both mischief and affection in abundance. As Haruka enters young adulthood, the family must weather this new phase and adapt to her increased responsibilities, balancing caring for the younger siblings with integrating into adult life.