One night on her way back from shopping at Kagami Mall, Sakuno Uryū gets lost and she calls her older brother Shingo to come find her. With initially no luck in finding her, and with her cell phone battery nearly dead, Sakuno gets help from a girl passing by, who offers to call Shingo. Shortly afterwards, Shingo meets up with Sakuno and the girl who helped her, Airi Sena, in a nearby park. Shingo, Sakuno and Shingo's friend Hayata Mukunashi, who attend Kagamidai Private Academy, are three of the students chosen in a group to take part in a temporary ten-month transfer to Yuijo Private Academy, which until now has been a prestigious all-girls school. Upon entering the school grounds, they meet Angelina Nanatsu Sewell, a student and maid at the school. Airi forcefully brings her mother and principal of the school to meet the group from Kagamidai, who were waiting for her arrival.

Angelina, Airi and Sakuno see what they think is Pannya around town, but soon realize that it was in fact Pannya's mother. The Nuko Club members go to where Miu first met Pannya and see Mamanya (Pannya's mother) and another smaller Pannya-like animal with her. The club members realize they have to let Pannya go back to its family, though this weighs heavy on Miu most of all. Airi is inspired by Miu, who can still smile despite having to give Pannya up, to help the school merger succeed, and organizes a student rally for the cause. Miu tries to be overly happy towards Pannya, but breaks down in the club room and cries on Shingo's shoulder. After talking with her mother, Miu finally resolves to let Pannya go back to its family. The club members go to the forest clearing where Miu met Pannya and it is reunited with its family after the club members say goodbye. Time passes, and in the spring the school merger has been completed. After Miu graduated, Sana becomes the club president.