St. ? Dragon Girl, Vol. 3

Momoka Sendou (nicknamed "Dragon Girl") and Ryuga Kou are childhood friends. Momoka is a martial artist, and Ryuga is a Chinese magic master who banishes demons. In order to increase his power, Ryuga calls on the spirit of a dragon to possess him, but the spirit enters Momoka instead. Now the two must unite forces and fight demons together

Momoka and Shuran befriend the spirit of a young boy who can't remember who he is or how he died. The girls try to help, but Ryuga wants to banish him immediately--especially after he learns the boy took possession of Momoka's body