Dragon Crisis!

Ryuji Kisaragi is an ordinary high school student whose quiet routine is upended when his second cousin, Eriko, suddenly returns. Before long, the two end up taking a relic box from a shadowy broker—only to discover it contains Rose, a girl who is also a red dragon.

With a dangerous organization now after her, Ryuji chooses to protect Rose by drawing on his ability as a relic handler, pulling him into a world of urban fantasy battles, unexpected romance, and escalating danger.