If you're looking for manga similar to Youkai Hunter: Mashougatake, you might like these titles.
"Demons." Ageless, immortal beings living in the shadows of the mortal realm. The way to gain immortality is to kill a "Demon"; the price is to take on their role. A man who killed his Demon lover; a Demon who commits suicide over and over without someone to kill her; a girl who interacts with Demons.... The curtain rises on a life-and-death stakes game of musical chairs between Demons and mortal humans.
Once upon a time, a little girl in ancient Japan met a Kappa. After that she seems to have her eyes opened and encountered many mythological creatures in her daily adventures.
Seiichi Takamagahara is a high school freshman living alone. One day, he finds a picture book among his grandmother's possessions. The monsters depicted there were not just pictures, but the monsters whose ancestors had sealed long ago. After a long time, the power of the seal weakens, and youkai are released to the world. The reincarnation Seiichi decides to seal the scattered monsters again with the fox god and silver.
Yuuji Abe meets a mysterious girl at the subway station. This chance encounter with Kana and Rou, her wolf companion entangles Yuuji in a plot concocted by the Seven Heads, a group of half-demons who want to bring a type of utopia where humans and demons can live together peacefully, albeit through unscrupulous and forceful means. As the group targets Kana and her companions, Yuujo begins to discover the truth not only about Kana, but about his own ancestors, and ultimately comes to terms with his budding feelings for this mysterious girl.
This is Ura-Kyoto, I'm a fox. Kaoru pretended to be a human and worked as an office worker, but she was sexually harassed on a crowded train, and even cheated on by her human boyfriend... "I will stop being a human and return to being a fox!" She shouted, and returned to "Ura-Kyoto", the true back of Kyoto where youkai live! When she is about to visit her grandmother, who lives in Ura-Kyoto, she is told by Haruhiko, an onmyoji whom she has met, that "her grandmother's house is sealed"...!? !!
High school student Takahara Yachiho has just moved into a notoriously haunted house on the outskirts of town. With only her cat Fuku-chan for company, Yachiho is disturbed by strange sounds and happenings…until the day she comes across a small passage leading to a hidden lower floor. There she discovers spirits of all shapes and sizes, guided by the tiny supernatural “manager” Moro. If Yachiho is to call this place home, she’ll have to deal with its ghostly denizens–and find a mysterious book that may be the key to locating her missing mother.
Jin Mikasa is heir to the Mikasa shrine, training to become a shrine priest one day. But like normal high-school boys, he is...er...curious about the opposite sex. One day, a cute girl--no, a cute demon fox girl--rolls into his place. She is Kogane, a half-demon, half-human fox girl who came to the human world to fulfill her dream, which is to become a full human. In order to do that, she must be united with an heir to a shrine. Is Kogane the dream girl Jin wished for? Until he can find out, Kogane will stay with Jin in the human world. Thus begin Jin's funny adventures with the fox girl Kogane.