SEX PISTOLS

An average boy named Norio is suddenly getting a lot of unwanted romantic attention. A fall down the stairs into the arms of a handsome stranger sets off the beginnings of an explanation, and it is one Norio never could have possibly imagined. Soon a whole new world opens up for Norio revealing a secret society of special people evolved from animals other than monkeys. Norio turns out to be a particularly rare breed and his DNA is in high demand. Now that he's suddenly the prey, it'll take much effort to survive in this modern jungle.
This story revolves around a high school boy who discovers that he is part of a select group of humans who did not evolve from monkeys, but various animals such as leopards and black bears.
(Source: Anime News Network)