Boroboro no Elf-san wo Shiawase ni Suru Kusuriuri-san

An apothecary runs a small workshop in a rural village. One day, he is approached by a familiar pawnbroker, who offers him a battered elf slave to be used as raw material for his medicines. The apothecary, disturbed by the countless scars on her body, decides to try to heal her instead.
(Source: Nico Nico Seiga, translated)