Nomura Nao to Kyougoku Hina wa

Nomura Nao and Kyougoku Hina, sit in the same class. Nao has always had trouble with Hina, who seems to always be in a bad mood. But one day after school, she runs into Hina who is taking care of her younger siblings. Nao dislikes her own family, but seeing Hina as a caring older sister, Nao's opinion of Hina changes drastically. As Nao spends time with the Kyougokus, she starts to learn what family is really about.