Tomoko Yoshikawa

Chinatsu's older sister, who attends the same university as Akari's best friend, Akane. 19 years old. Initially, her face was not depicted.

Having experienced the tea ceremony, she is polite, and thus revered by Chinatsu as her "admirable big sister," which inspired Chinatsu to join the tea ceremony club (and subsequently the amusement club).

She talks about Akane to Chinatsu as her "prideful friend," and admires Akane to the point of saying she's "jealous" of Akane's sister, Akari. She is overprotective towards Chinatsu to the extent of genuinely praising her drawings without surprise, calling her a "technician" during massages, and even referring to her ear cleaning skills as "like the roadwork of burly men." Overall, she is purely affectionate, doting on Chinatsu, deeply admiring Akane, and cheerfully hosting Akari and others as a positive presence.