Meet Risa, Fukuyama's younger sister and one dedicated troublemaker. To make matters worse, for Miharu at least, she believes that Yukinari is her "destiny." Risa will stop at nothing to jeopardize Miharu and Yukinari's relationship. Thankfully, the couple has insightful friends like Kirie to help undo Risa's mischief but will her efforts be enough against Risa's chaos?

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.