MC has supernatural power and can see things that normal people don't see. It can be anime or manga. Preferably 12-30 episodes.. Here are the examples of the anime/manga I read/watch: xxxHOLIC Nurarihyon no Mago (Nura: Rise of the Yokai Clan) Kekkaishi Natsume Yuujinchou (Natsume’s Book of Friends) Noragami Kamisama Hajimemashite Kyoukai no Rinne
Gingitsune, Hozuki no Reitetsu & Jigoku Shoujo for the new ones but the first 2 are 1 season only (+/- 12-13 ep). Apart from those already mentioned above, all I could remember are those of "classic" (as in pre-year 2000) such as Gegege no Kitarou, GS Mikami, Devilman & Jigoku Sensei Nube