Saigami. Volume 1, (Re)birth by flame

"A troubled girl's life changes when she ends up in a fantasy world with dragons, curious characters, and her own emerging ability to control flames. The girl known as Ayumi is a troubled European teenager whose love of manga and books keeps her happy though she lacks honest-to-goodness friends. But this is not the case in the fantasy land known as Aesztrea. In this strange new world, there are dragons, creatures, and warriors who can wield power...