Otona no gišiki (E10)

Ryuji, Rose and the others head off to go camping on an autumn weekend when a mysterious girl suddenly appears. She is Sapphie the blue dragon, with the ability to control water. She has come to avenge Onyx, her fiancee! Ryuji and Eriko fight Sophie off, but her words cast a shadow on everyone. Things get dangerous when Rose expresses great interest in finally meeting a dragon her own age. (Crunchyroll)