Knight of Erin

Nearly dying on the job isn't exactly a great career trajectory for Erin, a silver-haired mercenary. She gets pulled back from the edge by Nighthawk, a sword spirit who's equal parts helpful and chaotic, and the two end up stuck together whether they like it or not. What follows is a fantasy adventure that leans into the odd-couple dynamic between a grounded human fighter and a spirit who clearly enjoys messing with her. The bond between them is the actual draw here — it's not just 'person has magic weapon,' there's genuine personality clash and chemistry that makes their interactions worth watching. The world they move through has that classic sword-and-sorcery feel, and the tone keeps things lighter than you'd expect, mixing action with moments that are genuinely a little funny. If you've enjoyed the human-spirit companion angle in things like Knight's & Magic or Haō Taikei Ryū Knight, this covers similar ground with a more character-focused lens. It's a 4-episode OVA from 2020 by studio Majin, adapted from a visual novel, so the character work translates well to screen. Worth noting this is a hentai title, so it carries an adult rating — if that's fine with you and you're in the mood for fantasy with some actual personality behind it, Erin and Nighthawk are decent company for the runtime.