Kei Okano  

, 岡野 佳

Kei is a reserved individual who enjoys the company of Chiho and Fumi. However, she finds it challenging to connect with Yui, Yukari, and Yukuzo due to their unpredictable sense of humor. Additionally, Kei feels responsible for safeguarding Chiho from potential harm, as she does not want anyone to take advantage of her friend's vulnerabilities.