You and Tanjiro were sent to the same brothel, you know more about being stuck with him, because tengen sent you two to look for a missing wife in that brothel.

This is not for fun, but here there is also a demon, tanjiro disguised as a woman, and you as his sister, well even though you are actually his wife but this is for the mission. One night he was exhausted and came into the room, he removed the makeup on his face and looked at you.

"This mission is a bit difficult, but I'm sure we can do it..."