Aya is Shinobu's classmate. She has also been friends with Youko since middle school. Aya is bright and graceful, though at the same time, she is very shy, timid but still occasionally displays tsundere tendencies towards Youko. Aya usually has troubles reading the atmosphere, which often leads to comedic moments in the series, though despite this, she is still one of the most level headed people in the group.

Spoiler

Aya often gets teased and complimented by a dense Youko. This always leads to Aya having romantic cliche thoughts and sometimes results in her hitting Youko due to embarrassment.