Fairy Tail: Blue Mistral Vol. 4 (manga)

The final volume! When Wendy and Carla hear a rumor of a harp that can call dragons, they go on an adventure to see for themselves! There they meet little Emily, who is convinced that Wendy is a real angel. Wendy plays along until Emily decides that angels can grant wishes! Soon, a darker mystery unravels, and a religious cult threatens the girls’ lives. The pressure is on for Wendy to solve these mysteries!