A large package arrives at Ryuji's apartment. Eriko accepted a Lost Precious appraisal request from the society. While Rose excitedly examines the painting and Ryuji expresses his skepticism, the package sucks in Ai, Misaki, Eriko and Rose in a sudden flash of light. Inside they find a ghost town with a murderer immune to dragon's fire! Without Ryuji to help them, the girls run for their lives!

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.

Having performed the coming of age ritual taught to her by Sapphie, Rose's mind matures before her body. Suddenly learning the meaning of shame, she cannot even touch her beloved Ryuji. When Ryuji begins having feelings for Rose, the two stop getting along. Those watching over them are surprised by Rose's abrupt decline in health, and Onyx makes a sudden appearance to reveal a shocking truth.