Yuuki Nako

A girl from the neighbor class, nicknamed "Kinako" by protagonist.
She lost her parents at a young age, and currently, she lives alone, making ends meet thanks to scholarship money and part time work at glasswork studio.
From Yuu's point of view, she's a girl friend he met at this school, and even though they often quarrel, they get along well. However Nako herself sometimes hints that she knows him from the past.
Whenever she gets surprised or angry, she wields her red Piko-Piko Hammer, smashing whoever is at hand - usually protagonist.
She's a member of broadcasting club, and her bizarre duo with Miki is famous among the students, being one of the school's hidden attractions.