Genjuu Chousain (幻獣調査員, lit. "Mythical Beast Investigator") is a light novel series by Keishi Ayasato with illustrations by lack. A manga adaption with art by Koichiro Hoshino is serialized in Famitsu Comic Clear.
In the whole world there lay various mythical creatures which have their own ecosystem and can't be considered to be a part of the food chain. They also have supernatural powers and live together with humans. Ferry is one of the professional investigators, a Mythical Beast Investigator, who research the connection between the creatures and humans.
The story starts when a flying reptilian dragon (wyvern) is attacking a village, and a Girl dispatch on the quest to research and investigate wyvern and other mythical creatures.