Paulina is a timid girl who gets startled easily. She’s never dated anyone before because she feels that most guys tend to objectify females and only date them for sex. As a result, it can be difficult to get close to her, let alone ask her out.
Cecilia is a popular girl at the protagonist’s college with a high-and-mighty attitude. Like Paulina, it’s difficult to ask Cecilia out for a date but not for the same reason. Cecilia looks down upon otakus, seeing them as stereotypical losers who can’t get laid.
Luna is considered a pervert because she’s always talking about things like cybersex but this makes her more approachable than Cecilia and Paulina when it comes to romantic advances. Luna is at the top of her class and may be able to help the protagonist boost his grades.