The story is about a genderbending Gumiho (Nine-tailed-Fox), who loses a bet in a game and loses all their tails. The Gumiho, Laon, goes down to Earth to search for his/her lost tails. Unfortunately, Laon's odd behavior causes lot of trouble down on Earth. Eventually, Laon finds a rather untrustworthy journalist by the name of Taeha Gwon who he/she believes will help with the search for the missing tails, whether Taeha likes it or not. The man also has his own secret past which he can't remember, revolving around his (supposedly) dead girlfriend. He initially dismisses Laon as crazy, until he sees Laon go through a wall. After finding Laon again, Taeha agrees to help Laon and forces Laon to stick with one gender because Laon's gender bending is giving Taeha a case of squick.
Soon, they get involved in some paranormal cases in the course of searching for Laon's tails. There's also a mysterious character who's interested in Laon's tails.
Laon has examples of:
- Asian Fox Spirit: Laon is a gender-bending fox-spirit who possesses a broad array of supernatural powers and originally had nine tails.
- Cute Monster Girl: Laon in her female form.
- Gender Bender: Laon can change genders at will, and seems to take on the gender opposite of whoever he/she's with at the time.
- Genki Girl: Laon when she is a girl; plus, Laon means "happy".
- Groin Attack: Taeha tries to sneak a peek at a sleeping Laon (to determine Laon's gender) only to get this for his trouble.
- I Am a Humanitarian: Laon is not above "tasting" people, lapping up blood, and and threatening to eat Taeha when he pisses him/her off.
- I See Dead People: Taeha Gwon
- Macguffin: Laon's missing tails, which they are searching for in order to reclaim their full power.
- Meaningful Name: Laon's name means "happy", befitting their usually happy-go-lucky personality.
- Oracular Urchin: Gyuri Han; her attaction to Taeha is partly because he's a supernatural Weirdness Magnet.
- Unlucky Everydude: Gyujin Han; after he slept with his boss, his luck has gotten worse. It doesn't help his older sister foretold his fate would get worse from that point on.