They are Aine's classmates at school.
These two particular girls only appear in the Anime. They try to be friends with her, but Aine is so shy, and after hooking up with Λucifer, very withdrawn.
They are very into all the latest trends, including all the cool rock bands. They are the ones who first point out Λucifer to Aine, though she doesn't really pay much attention.
They are Aine's only real connection to her school. They eventually become huge Λucifer fans, and manage to stand by Aine during a time of crisis, even when they didn't understand
what was going on.