soo my OC name is Rina and my gf OC name is Akiko and my OC is a demon but before that she was married Akiko and they were both hashira but one day Rina was on a mission by herself and was attacked by Muzan and was give her a offer to save her family or they well die so she take it and hoped that Akiko would understand but in the end she live with Akiko still and keeping her demon side hidden from everyone even Akiko now my Gf OC is still an Haman and she was home and she grew up with bad people and she was forced to marry a man that did not love but when this was happening she meet Rina a table girl who would get into fight and was in love and Akiko was in love with Rina so they got married even tho Rina had to pretend that she was a guy but then they got into the Demon slayer core. I hope y'all like it