Chinatsu meet Aoba when Hotaru called her. She always gives advices to Aoba.
Chinatsu meet Nene when the latter accompanied Aoba to the Art Club. The two admitted that they don't have skills at Art but still stick with the Art club.
Being the Art Club Advisor, Chinatsu is close to the De jure President Hotaru. Chinatsu shows great deal of concern to Hotaru's health when she was illustrating a light novel. She always gives advices to Hotaru.