Larfa is this game’s main heroine, the alien trying to make Yuusaku her wife. She is the daughter of a space overlord and extraordinarily beautiful. Her breasts are on the large side and her bangs are actually antennae that form a heart-shape when she sees someone compatible and move to reflect her emotions. She is madly in love with Yuusaku and thinks about nothing but him. She is bright, simple, and straightforward. She’s also the type who becomes inflexible and loses sight of her surroundings once she makes a decision. This flaw is why some consider her a troublemaker. After seeing Yuusaku’s porn, she comes to believe that what she saw was normal for Earthlings. She possesses a bracelet with several functions such as instant costume change, short-range teleportation, and the ability to create a small space that the wearer imagines, as well as several other sex toys made from their advanced technology.

Shiori is Yuusaku’s childhood friend and the other heroine of this game. She has long held affection towards Yuusaku, but until Larfa showed up, she held back her feelings and continued to be just friends. When Larfa appears, Shiori finally becomes honest with herself and starts her fierce attack on Yuusaku. She is usually quiet and subdued, but she gets very jealous when it comes to Yuusaku. With her mind now set, she starts taking bold actions she never would have before. She used to be a member of the tennis club, but she resigned from it. She also has a complex about her under-developed body.

Laylia is Larfa’s mother and a space overlord. She looks warm and gentle, speaks slowly and seems rather stupid, making many wonder if she really is an overlord. She has Larfa’s best interests in mind, and tries to help Larfa win over Yuusaku, but her methods are absurd. To make sure he and Larfa have good sex, she tries to teach him the art of sex. She usually wears one of the bracelets too, and halfway through the story, she infiltrates their academy and takes over as their homeroom teacher.

Mia is Larfa’s childhood friend and rival. She is a sexy, furry cat-girl with cat-ears and a tail that move in reflection of her emotions. She wants to obtain everything Larfa owns, but doesn’t show any tenderness. She is the type who will do whatever it takes to achieve her goals. She tempts Yuusaku at every opportunity.

Vanilla is Larfa’s childhood friend and her best friend. She is a bunny-girlish alien and rather used to having sex. She has sex with Yuusaku in the name of teaching the heroines. She has a frank personality and is considered the big sister type. Her ears move in reflection of her emotions.

Aqulia is a female space pirate as well as an alien. She is the type who will never rest until she obtains what she sets her sights on, and this time her target is Yuusaku. She wears a bondage suit over her dynamite body.