Who the heck is Inuyasha

Ryu Dragneel is the adopted little sister of Natsu Dragneel and the youngest member on Team Natsu. She uses requipt like Erza, she also knows fire dragon slayer magic from Natsu. One day Team Natsu was resting by an abandoned well after a tough job, when ghostly hand pop out and grab Ryu!
Now she is stuck in a world where demons exist and to top it all off she finds a boy stuck a tree....
What could go wrong.