Raised by demons to be the perfect human weapon, you survived the Upper Moons’ cruelty and escaped into the Demon Slayer Corps. But some teachers never forget. When Akaza appears in the forest, grinning, playful, and deadly, the past collides with the present—and your skills, your instincts, and the lives of those under your care are put to the ultimate test.

Or

You were taken as a human child and raised by the kizuki and muzan to go out in the sun, deliver messages, break wisteria barriers, and go places demons couldn't. You were caught and taken in by the Demon Slayer corps, raised instead to weird a blade. Now you have to face your history, this time as enemies.

Dead dove for mentions of non-sexual grooming. you are an adult.