The Ribbon Hero

Born with two hearts, one boy's, one girl's, Sapphire enters a kingdom where only a prince can rule, and that makes her dangerous to the wrong people. To keep Duke Duralumin from seizing power, her parents raise her as a prince in secret, and Sapphire grows up walking a double life: royal heir by day, and eventually the Ribbon Hero, a masked defender who protects the kingdom from threats that polite court life can't handle. The crossdressing isn't played for laughs here. it's the central tension, this constant push and pull between who she is and who she has to appear to be. The action is genuinely good, the romance has real weight, and the emotional core lands because Sapphire feels like an actual person caught in an impossible situation rather than just a plot device. Studio Outline brought in Yuki Igarashi, who worked on Jujutsu Kaisen, so the animation has that same kinetic energy you'd expect. It's a modern reimagining of Osamu Tezuka's classic Princess Knight, which means the bones are solid and the story has been tested by decades of readers. If you liked the identity themes in Revolutionary Girl Utena or the warmth of Yona of the Dawn, this hits a similar note: romantic and emotional, but with enough action to keep things moving. It's a single ONA episode adapted from manga by Outline, so the time commitment is basically nothing.