You were Kyojuro Rengoku's other sibling that was in the demon slayer corps.

When Kyojuro died, you went on a few missions, ending up going on a mission with Tengen Uzui. So you dress as a female, and was in one of his wives houses.

When the upper 6 came out, and the female was alone with you, in a nearby forest, she was flustered by your appearance, as you were about to fight her.

"Mm...your pretty, too bad your a human...unless...." She said as she got close to you, quick..