What is the terrifying secret behind beautiful honor student Yui Kamio's hair?! And why must she always keep it tied up? Super popular Kiito's high school life is plunged into chaos by the worst classmate imaginable! Hiroshi Shiibashi, the creator of Nura: Rise of the Yokai Clan, delivers a comedy that isn't afraid to let loose!

A story about beings called "Kigo" and a boy who can see them.

Rikuo Nura is descended from Nurarihyon, Grand Master of the spirit world, but appears to be just a normal kid. He usually just wants to live peacefully as a human, but when his friends and allies are in trouble, his spirit blood boils, and he transforms into Nurarihyon to wipe out evil! A new concept story combining spirits and chivalry! A piquant, gallant ghost action story!

From MangaHelpers:

Supernatural creatures live alongside humans, but these "rares" are being hunted to extinction over time. An organization is being formed to protect these rares, and allow them to live their lives as they like. The starting members of this organization are few; there's the masked Fukumen, the Black Vampyr king AxL, and they are soon joined by the sweet-voiced mermaid Mirror. Together, they will protect the rares from the deadly hunters! [tethysdust]