Wagaya no Oinari-sama.

Wagaya no Oinari-sama., which translates to Our Home's Fox Deity. , is a Light Novel series by Jin Shibamura, with illustrations by Eizō Hōden. It was given the anime treatment by Zexces, which ran for 24 episodes in the Spring of 2008.

Tooru Nakagami, being the heir of the Mizuchis, is about to become a major target for demons, ghosts, specters, and other otherworldly things. So, when Tooru and his brother Noboru visit their grandmother way out in the country, Tooru finds himself with a bodyguard in the form of Kuugen Tenkou, a fox spirit entrusted to the family. A sentinel from the shrine, Kou, comes along with them back to their city, where trouble follows them. Wagaya no Oinarisama has a focus on the supernatural, but the likable cast interacting in (or trying to get used to) today's world is a great source of fun as well.

NIS America licensed the series as one of their first anime titles.

This series contains examples of:

Attack of the 50-Foot Whatever: One of the post-episode trailers during the Byakki storyline showed Shiro-chan and Kuugen transforming into gigantic, Kaiju-esque forms and facing off against each other. This doesn't happen, however.
Big Eater: Kuu, hands down. Do NOT take your eyes off your food when dining with her; it'll likely disappear in an instant!
Chick Magnet - Noboru is quite a hit with the ladies, despite him being mostly clueless.
Cuteness Proximity - Daigoro seems to have this effect on most people when they first meet him.
Dancing Theme - "Shiawase no Kotodama", the second end, featuring the entire cast in a cute, Super-Deformed style.
Elemental Rock-Paper-Scissors - The relationship between the elements is a deciding factor in Kuu and Kou's battles, but a bit of magical Applied Phlebotinum, the Sakasaen, can reverse the way the relationships work.
Evil Albino - Byakki is a being who insatiably absorbs the life-force of every living being she touches (even by accident) who is completely white with red eyes. This is somewhat inverted however in that she's unwaveringly loyal to Tooru after imprinting on him and even defends him from attack on several occasions.
Eyes of Gold - Kuugen's eyes (which are normally blue when in human form) take on this shade when in quadruped form or when tapping into his/her power to deliver a royal ass-kicking. Kuugen's sibling Gyokuyou has these on a permanent basis.
Fish Out of Water - Kuu and Kou are largely unfamiliar with the modern world, but as time goes on they catch onto it and combine modern tech with magic to help them solve what comes up.
For Halloween I Am Going as Myself - In a town populated with spirits, it makes sense. Doesn't really work out very well for Ogami-san, though.
Gainaxing - Berika, subverted in that they're not actually her breasts. Kuugen experiences this on a few occasions in her female human form as well.
Gender Bender - Both Kuugen and Gyoukuyou can switch between male and female forms at will. Both also qualify for No Biological Sex, being spirits, and in Kuugen's case being too old to remember what sex he/she originally was.
Girl in a Box - Byakki/Shiro-chan. (May also double as Sealed Evil in a Can)
Hand Puppet - Mubyou. Kuugen also uses one against some hapless blue Oni in a couple of episodes.
Hot Springs Episode - Two, the second with Very False Advertising.
I Know Your True Name
Imagine Spot - Misaki Sakura, Noboru's secret admirer, frequently launches into fantasy sequences either mistaking Kuu and Kou for his girlfriends, or about Noboru and herself.
Immortal Immaturity - Kuugen, while having many smart moments considering his/her age, also has a few...not so smart. She can also act incredibly childish when she doesn't get her way with Noboru.
Kitsune - Kūgen and Gyokuyou, naturally. Ogami Itto and his son Daigoro as well.
Little Black Dress - Kuugen dons one when she (quite literally) crashes Miyabe's Christmas party in episode 22. Even more impressive in that she doesn't get a scratch on it when going head to head with Miyabe's transformed state.
Macross Missile Massacre - More like Macross syringe massacre, as Kuugen uses her abilities to launch a huge volley of syringes loaded with anti-lycanthrope vaccine at the other werewolves serving under Miyabe in episode 22.
Miko - Kou
Mundane Fantastic
Marshmallow Hell - Kūgen does this to Noboru in the third episode.
Missing Mom - Noboru & Tooru's mother died shortly after Tooru was born. She's largely seen only in photos and flashbacks, though in episode 5, Kuugen performs a forbidden ritual that allows her ghost to appear and briefly visit with her and Tooru.
- Miyabe is revealed to not have a mother either. Skirts perilously close to Parental Abandonment as her father is rarely around either, to the point that she grows resentful of his extended absences.
Never Trust a Trailer - The Post Episode Trailers begin normally, but as the series goes on, they start to show things that never happen in the next episode.
Perpetual Poverty - Taking on two more people, plus Kou's tendency to break things, makes the family budget run very tight.
Petting Zoo People - Of all sorts.
Religion Is Magic - The whole series is practically bursting at the seams with this, drawing heavily on Shinto legend and mythology.
Robotic Reveal - Mubyou, after being on the end of a reflected fire spell.
School Festival
Wolf Man - Miyabe