Chika is seen wearing the uniform of Kaihin Sougou High School that is composed of a white dress shirt, a light blue sweater with two dark blue lines at the top, a red tie, and a navy blue blazer.
Nothing about Chika's personality is mentioned either in the Light Novel or the Anime.
Chika appears to be a composed individual. Even when meeting Hayato Hayama (Chika's crush), she was able to not overreact.
However during the "double date", Chika shows an inability to read others emotions and carelessly taunts others. When Kaori Orimoto would poke fun at Hachiman Hikigaya, she would join in and laugh along with Kaori.
Chika and Kaori Orimoto run into Hachiman Hikigaya and Haruno Yukinoshita. Kaori mentions mentions to Haruno her friend Chika is interested in Hayato Hayama, in which Haruno calls Hayato out to meet her and she introduces him to Chika.
Later, Kaori and Chika arrange a date with Hayato and begrudgingly Hachiman.
Throughout the date she gave all of her attention to Hayama and ignored Hachiman. She along with Kaori wanted Hayama's opinion on clothes, sports gear, movies and food.
Later in the date, Hayama asks what they would like to eat, Chika responded anything would be fine for her. But when Hachiman suggested Saizeriya, Chika and Kaori gave him a reproachful look and asked Hayama where to go instead.
Hayama guides them to a nearby cafe. In the cafe Chika and Kaori praise Hayama's restaurant choice and belittled Hachiman's suggestion. Hayama expressed his dislike of the girls behavior, not sure what he meant Chika tried agreeing with him to brush it off but Hayama continues stating that Hachiman is far better than what they make of him and he (Hachiman) gets along fine with girls who were lovelier than they could even imagine.
Even though she isn't seen again, Hachiman suspects there might be a strain in the relationship between Kaori and Chika due to this incident.
In the aftermath of the double date and it's impact on their relationship, their friendship becomes questionable.
- Her name Chika means "thousand" (千) (chi) and "good, beautiful" (佳) (ka).
- Chika's surname Nakamachi means "relationship" (仲) (naka) and "town" (町) (machi).
- Chika is the second girl from Kaihin Sougou High that is introduced to the audience.