The anime is from some years ago. I remember a scene were the protagonist (a samurai) encounters a woman on a japanese bridge. He knows something is off and calls out the impostor. The woman then transforms into the protagonist love interest to seduce him, but he attacks, causing a cut in her chest, but the monster regenerates instead. The protagonist tries to flee, and the monster chases and reveals her true form: an antropomorphic black demon fox (similar to Zoroark from pokemon) and they start to fight. I am looking for the name of this anime.