Anyone seen or read this? My niece texted me the other day asking if I could check it out because she wants to read it and watch it. I've never heard of it so while I research, I thought I'd ask.

My niece is 13 so I'm needing to know how appropriate it is. She's not very particular what she chooses to expose herself to but, of course, her parents are. But her mom (my sister) doesn't care for anime or fantasy so she tends to follow my recommendation on what she allows my niece to see. (We had to talk her into allowing my nieces to watch/read Harry Potter just a few months ago.)