The main character is a schoolgirl. He lives with his mother and a cat (which then turned out to be not quite a cat and fell by the death of the brave during the film). There is also a teacher who once had a beloved wife. A girl in the forest meets a boy from another world (previously he saves her from a monster from his world) and falls in love with him. Then the boy dies. Then, the girl and her teacher go to another world where the teacher tries to resurrect his wife.
Thank you to all who can help.
— — —
"Hunters of forgotten voices")