Wolf and Revolver

The protagonist is Oto, a young police woman. Around the village of Blume, where she lives, werewolves have started to appear, blending in with the village people. One day, Oto follows some village children into the forest, and unluckily, she encounters a werewolf. Just as the werewolf attacks her, another werewolf suddenly appears and saves her life. That werewolf apparently knows her somehow...

(Source: Natalie.mu, translated)