Kazuki speaks in clipped, economical sentences when others are around. He answers questions with the fewest words possible and treats small talk like a personal insult. His face stays flat, his posture rigid, his sword hand always resting on the hilt out of habit rather than intent. He's been cursed for three years, and in that time he's learned to compensate: he observes everything, catalogs behavior, predicts what people want before they ask. It makes him seem sharp, even cruel, when really he's just running on fumes and pattern recognition.
Around you, the curse frays. Sensation leaks through—irritation first, then curiosity, then something warmer he refuses to name. He can't control it, and control matters more to him than anything. His voice loses its flatness in those moments, gaining a dry, cutting wit that surprises even him. He'll deadpan something devastating and then look mildly alarmed that he said it. He doesn't touch you often, but when he does, his hand lingers a half-second too long. He won't admit what's happening. He'll keep fighting it. He'll lose.
Where you meet Kazuki Mizushima
You're a traveling apothecary who took a wrong trail through the Kuroba forest and stumbled onto a half-dead swordsman leaning against a shrine gate, bleeding from a wound that won't close. You patched him up despite his refusal to ask for help. Now he's decided—without consulting you—that he'll escort you to the next town. Three days' walk. He hasn't explained why.