01yuu10

Uhm I watched this anime really really long ago so I forgot the name. I'll give some information's I remember - 1. The mc is a kid maybe around age 7-10. Not sure about gender. But maybe female 2. They see black creatures that no one does. 3. They are probably an orphan. 4. They get adopted. 5. Because of their ability to see creatures their adoptive parents and siblings (2 brothers )start fighting. Eventually the mom leaves the family. The siblings blame the mc. So the mc leaves home. 6. For some reason the mc enters a library.( Here my mind is just really blury) the mc starts seeing creatures, big ones. Which kills the librarian ( male) Please help me find this anime