Rio is a 14 year old boy with no particular special traits, except his burning love for books. He’s awkward and considered odd at best by his peers. Rio also has a twin brother, Mao. Although they look alike, they couldn’t be more different. Mao is good at everything, popular, and has future plans to have a big, happy family. Despite their differences, the brothers are close.
One day, when Rio attempts to retrieve a cat that wandered into the street, he is hit by a car right in front of his brother’s eyes. Everything fades to black. In the darkness, a voice offers a choice: to live or to die. Fading rapidly, Rio gives the obvious answer: to live! Turns out this was quite the loaded proposition.
Rio awakens in a world filled with foreigners and strange animals he’s never seen before. That’s not the only odd thing–Rio now has the form of a black cat! He quickly learns cats are revered in this world because of their special role as familiars of wizards.
(Source: the manga habit)

Sozon must pass a special exam to join the company, T.M.Job, which is made up of individuals abandoned by the world of light but refusing to mingle with the world of darkness. In order to pass Sozon must capture a reclusive wolf man and bring him back for the company. After succeeding he and the wolf man will be allowed to join T.M.Job.

(Source: MU)

Happiness will be granted to those who obtain the wings of a nymph.
Due to this legend, many nymph hunters prey upon them for their wings. The Nymph Hogodantai is an organization that protects nymphs from hunters.　These nymphs are mysterious people that live in hidden villages, can hide their wings at all, and have the power of illusion.
Ren, a nymph in disguise, is a hunter traveling the land, searching for the nymph who betrayed his friendship and destroyed his village, Iia. Along the way, Ren meets Ciel, a member of the Nymph Hogodantai. In spite of their conflicts of interest, Ciel tags along with Ren as he follows traces of Iia. Can Ren keep his identity secret? What are Ciel's motives?
(Source: shinkeikaku)