Meet Yukinari Sasaki, an average high school boy who has extreme gynophobia--and an allergic reaction when girls touch him. One day he befriends an alien named Miharu, who comes from a planet whose population is 90% female. Remarkably, Yukinari is able to touch Miharu without breaking into a rash! He returns to his own world, accompanied by Miharu, but shortly thereafter, other girls follow them to his world...and his life turns into a one big mess.

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.