芹ヶ谷 薫子Sarigiwa Kaoruko
from Hanebado!
Serigaya Kaoruko (芹ヶ谷 薫子) is a 1st year student of Kounan. She is a key individual in Hanesaki Ayano's life. Kaoruko is a tall girl with pink eyes and long hair of the same color that she has tied into twin tails. At school, she wears the standard Kounan High uniform. Kaoruko is a very confident, boastful, and excessively self-conscious, in addition to talking like an ojou-sama. She initially compared to herself to a butterfly, stating that others simply followed her, and added that she didn't have any rivals in the prefectural tournament. Despite this, she is the one who knows Ayano well the most, and helped her come to terms with her personality and made her realize that she wanted to be a kind person. Kaoruko is shown to have feelings for Tachibana Kentarou, mentioning that he was cool.

Hanebado!
Ayano Hanesaki, a first-year student at Kanagawa Prefectural Kitakomachi High School, has a badminton ability able to surpass others effortlessly yet avoids playing the sport. She meets Nagisa Aragaki, a third-year student who practices day and night aiming to become the best player in Japan. Encouraged by coach Tachibana Kentarou, supported by club colleagues, and fired up by various rivals, the two engage in their youth and adored sport so thrilling like a shuttle flown at high speed!