Unknown Tail

This story is about a girl named Akira, as she becomes friends with a boy, but the thing is, he changes her life, first was the tattoo, than she helps him find his lost cousin, but it's harder than she thinks, as she finds out that her new best friend is a dragon, and that his cousin is too, but she doesn't know what he looks like as the story carries on, they find him, but things happen to the 3.