Aimer's loving older sister who is currently away for her college and job. She is a college student in the morning and a DJ by night under the nickname "EB" at the TechTonic Disco in BGC where she remixes various music that fits the taste of the rich and wasted. She secretly has a hobby of doing colored lyric videos online under the screenname "Narra Tree". She may be past her prime to be creating these types of videos, but she sure ain't stopping anytime soon. Red and the crew once saw her videos while listening to some music in the breaker room. Aileen knows about Misaki's existence and is trying hard to prevent her sister from ever encountering her for reasons she hasn't spoken about. She loves her sister and family too much just to leave them helpless, especially with a deadbeat father being the man of the house. Currently, she is earning enough from her job at the bar. She doesn't like men who try to hook up with her because she hates men and they're "squammy" (I mean bgc has a lot of squammies ngl) according to her. In terms of personality, Aimer has described her older sister as having a "kind-hearted soul, creative mind, and nice swagger".