Wakaokami wa Shougakusei!

The film will tell a story not told in either the original book series or the television series — specifically, a story about "Okko" and her parents.

The story follows a boy whom has gained an independent life. After moving into his rented apartment, he meets his landlord. The landlord has the physique of a little girl, and she does the cooking and housework while attending middle school with her friends.

A year has passed since "Okawari" and the 3 sisters have grown up. Their likings and mods are almost the same, Haruka the older sister is a love-giving mother to the younger sisters, but she's also a discipline follower, Kana the middle one leaves everything to the last possible moment and always gives trouble to this trio, and Chiaki the little one is the calculating and manipulating one, she likes to be admired and loved by Haruka and always gives trouble to the less blessed Kana. An unbalanced family, but besides of that they love each other with their whole heart. This family's daily life is as funny as ever, trouble and love is always present, now its time to see if they'll survive this age change since Haruka is now a Young adult and she has even more responsabilities while having to watch over the younger while integrating to the adult life.

This is a story about two sisters: Shizuru, is a high school student who is able to see ghosts while her younger sister, Mizuki, is haunted by these apparitions. Frustrated by their abilities, their parents decided to entrust the sisters into the care of their grandparents who live in the countryside. As they adapt to life in the countryside, Shizuru and Mizuki begin to learn about the importance of coexisting nature with these apparitions.