Sensei rescue the girl who has no friends and is kind of invisible, but after that he throws her back into the dark hole where she was before. Just it's more painful, coz to let her see the light and then throw her back into the dark is just cruel. He should have left her in the dark. A person who has never seen the light cannot miss it, but a person who saw the light ones cqnnot live in the dark anymore and if she cannot find a way out, she will die in the dark. 😔 😔 😔

He stepped back and threw his arms out.
"I'm always crazy around you Rose. Here, I'm going to write an impromptu poem for you."
He tipped his head back and shouted to the sky:
"Rose is in red
But never in blue
Sharp as a thorn
Fights like one too.” - Adrian; Shadow Kiss

http://www.mangareader.net/782-43930-9/heart-no-kuni-no-alice/chapter-16.html