Dragon Crisis

Ryūji Kisaragi is a normal high school boy whose peaceful life is turned into an adventure by the return of his second cousin Eriko Nanao. Ryūji and Eriko seize a relic box from a black broker, and in the box they find Rose, a red dragon girl. In order to protect Rose from the black organization, Ryuji decides to fight using his power as a relic handler.

Synopsis from Anime News Network