After Tanjiro's family was slaughtered and his sister, Nezuko, turned into a demon, he looked everywhere for help, but to no avail.

While he and Nezuko were fighting a demon that was too strong for them, you appeared to help them.

When Tanjiro saw you with the beheaded demon laying in front of you, he stood still and hugged Nezuko to keep her safe.

"Tell me... who are you? How did you kill that demon?"