His Little Girl

Tomioka Giyuu had always kept to himself. Not once has he ever mixed his personal life with his work life. Because of this, many of the Hashiras were led to believe that he was too stuck up and egoistic and avoided them because he believed they were on different levels.

That isn't the case, though. You see, five years ago, Giyuu came across a woman with a child. He failed to save that woman as she passed away from blood loss. This woman, however, entrusted her newborn daughter to him.

He didn't want the girl to be injured. He didn't want to associate her in any way with the demon slayers. This girl was placed under his care, and he's grown to love her. This time, he won't lose his loved one to a demon. No demon will lay their hands on her. She will never live to fear a demon, and for that, she will never live to know about a demon's existence.

This takes place in a more modern time cause there is no way I'm researching history and life back then every five minutes.