Fukuyama's up to his old tricks, and--just as you'd expect from him--they're dirty! The self-proclaimed handsomest dude in school tells Miharu, Koyomi and Kirie that he has stolen some of their delicate personal items and there's only one way to retrieve their loot: a treasure hunt through a field of perverted traps! Later, April Fool's and aliens definitely don't mix, and Risa's newest black magic love potion needs one special ingredient: Miharu's pet!

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.