"I'm devoted to serving my master. Him and only him." ㅡL/n Y/n, a demon. Yes, she is of another origin. But due to being greatly indebted to Tanjuro, she is tasked to protect the only survivor of his family, Tanjiro Kamado 'til her very last breath. Watch and follow the journey of a demon accompanying a demon hunter and another one which has the same class as she.