Akane Akaza (赤座 あかね Akaza Akane ) is Akari's older sister who attends a university. She secretly loves Akari romantically, often doing various obsessive perverted things with her belongings when she is not around and reading lots of doujins about sisterly incest while wearing Akari's panties on her head. She has a part-time job at a fast food restaurant and is friends with Tomoko Yoshikawa.
- She has never once been shown with her eyes open. Even when horrified by Chinatsu's art her eyes are always shown closed and in the same expression.
- Originally she was Akari's unnamed older brother but was retconned later on.