Elf wo Karu Mono-tachi EP4 - Frantic Killing! The 100th Target

Junpei and the others encounter Liepia, a beautiful but powerful Elf who has a mysterious mark on her body. She refuses to submit herself to them and fights Junpei, who shows her what the ""true spirit of fighting"" is all about. She is beaten, but the mark on her body is not part of the incantation.