Kyoukai Senjou no Limbo

As the child of an elf and a human, Fuu's unusual appearance made her an outcast in her village, and she solemnly decided to leave for the end of the earth. After smuggling onboard the train she finds herself in Limbo, a town unlike any other she's seen that's filled with all manners of creatures and people. Under the tutelage of Sensei, the owner of a shop that sells magical and technological goods, Fuu begins her new life as an assistant, getting to know the local residents and helping others as best she can.