Ryuuji Ayukawa

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Yatora's classmate and fellow art club member, they are responsible for inviting Yatora to the art club. Yuka has a talent for modern street fashion.

They are closest to their grandmother, who is the reason why they decided to pursue Japanese Art. Yuka will often put on a bright demeanor in front of themselves, and when placed in stressful situations they are often brash and impulsive. Yuka's mother and father both disapprove of their identity and lifestyle. It's shown that they don't have a very happy home life, and can only find solace in the company of their Grandmother, who is accepting of them and their aspirations. It is implied that they often go out at night to get away from home, and that their parents suspect them of trading dates with men for money.

Prefers to be called "Yuka", as they choose not to go by the name "Ayu" since their idol is singer Ayumi Hamasaki. Yuka is known to often crossdress and test gendered standards of clothing. In chapter 20, Yuka tells Yatora about their bisexuality, explaining how they fell in love with a female middle school friend, but also feels an appeal towards men as well.