Just when you thought things couldn't get any wackier, another roommate appears from the planet Siren. Meet Koyomi, the complete opposite of Yukinari--she has androphobia, the fear of men! When she starts living at Yukinari's house, Risa isn't exactly happy about this new chick getting in the way of her boy wonder. So Risa hatches a scheme to get Koyomi out of the picture, which includes a deluge of male fawning admirers. Will Koyomi triumph over her fear of men? Let's hope so. The Christmas holiday is approaching, and when you're wearing nothing but a string bikini, it's always good to curl up with someone on those cold winter nights!

Yukinari Sasaki
A short high school boy who has been mistreated by girls so badly that he's developed girl-phobia.

Miharu
This story's heroine. A kind and sweet alien with an enourmous appetite.

Kazuhara Fukuyama
The self-proclaimed "most handsome guy in Mizuno High School." He is hot, rich, athletic, and totally perverted.

Risa Fukuyama
Kazuhara Fukuyama's occult-obsessed younger sister.

Koyomi
A Sirenese agent who is afraid of men and has a hard time living on Earth. She’s been charged with finding a husband for Miharu’s sister.

Kirie
She lives next door to Yukinari, and is his childhood friend.

Tomoka
An adorable agent from Siren who may look like a child, but hates to be treated like one.

Ebi
Miharu’s cuddly pet. The name 'Ebi' comes from the fact that she looks like a shrimp.

Mario Kaneda (?????)
Other works by Kaneda-sensei include Farland Symphony, MMR (Magical Maid Ruri), and Romance wa Ken no Kagayaki.