Yukiko Asai (浅井 幸子, Asai Yukiko) is Tsuyoshi Naoe's girlfriend.
Originally, her hair was black but she dyed it orange for a cosplay event. It is often braided and swept at her sides. She wears a cream cardigan with dark blue collars and a red neckerchief, black thigh highs and brown school shoes.
Yukiko is a very cheery girl and constantly wears a smile on her face.