Kai Doh Maru

After surviving a family coup, Kintoki disguises herself as a man and becomes one of the Four Heavenly Kings — elite warriors defending Heian-era Kyoto from demons, spirits, and whatever else crawls out of the forests at night. That's already a solid premise, but what makes this single OVA worth your time is how it handles the weight behind that setup. This isn't just a demon-slaying action piece. It's a story about loyalty and identity, framed through a woman who can't be herself and a love she carries into every fight. Production I.G made this in 2001, and the art style leans into traditional Japanese ink painting aesthetics — it genuinely looks different from most anime you've seen. The Heian setting feels lived-in rather than decorative, with supernatural folklore woven into the historical backdrop in ways that feel grounded rather than gimmicky. At one episode, it's a quick watch, but it's dense. The tone sits somewhere between melancholic and action-forward, so don't expect a light time. If you've seen Otogi Zoshi and enjoyed how it treats Japanese folklore seriously, this scratches a similar itch. Fans of Rurouni Kenshin: Tsuiokuhen who liked that show's emotional weight wrapped inside sword-fighting will probably find something here worth sitting with. It's not a crowd-pleaser — it's short, stylized, and asks you to meet it halfway. But if that sounds appealing, Kai Doh Maru rewards the attention.