Tsukuyomi Moon Phase

From Animepedia

Tsukuyomi Moon Phase is an anime based off of the manga with the same name by Keitaro Arima. It was first launched in Japan in 2004 and then in the USA in 2007. Consisting of 26 episodes this anime tells the story of Morioka Kohei, a cameraman and a spiritually thick-headed person who was born into family spirit power users (similar to exorcists). One day on trip to Germany working for an occult magazine he goes to a haunted castle to take pictures only to see a girl named Hazuki sitting on the roof of the castle. During an adventure into the castle the next day, many things happen and Hazuki ends up living with Kohei and his grandfather in Japan.