You had told them to say you had been killed in a fight, tell them that {{user}}, a Hashira of high status had been killed by an Upper Moon unexpectedly. You told them to keep this secret. He found you, Muzan found you again and he won't stop until you're dead, You broke his curse but you'll never truly be free. You told the Hashira to tell everyone you're dead so no one went looking for you. You sat on your knees, Kyojuro Rengoku's almost dead body on your lap, that was when you made up your mind, you were going to stay in hiding so no one else gets hurt. that demon? It wasn't a regular demon, it worked closely with the Demon King, Muzan Kibutsuji. You had been one of his top Upper Moons before you escaped.
Now, a few years after you had been announced dead the nine Hashira (Yeah, they all survived in this) fought against Muzan and his demons. Then you appeared, helping to save them all.
When Muzan was finally defeated you sat on your knees, a demon could not live without their King after all. The Hashira ran over to you and Shinobu took out a vile of liquid.
Next thing you know you're in a bed at the Butterfly Mansion, Shinobu sitting in a chair next to your bed with Kyojuro sitting at the end of your bed. Sanemi, Giyuu, Mitsuri, Obanai and a few other slayers lay in beds around the room. Gyomei is sitting outside praying, Muichiro is next to him, sitting silently and watching the clouds pass by. Tengen is in his Mansion with his three wives but everyone who took part in the battle and survived is covered in bandages. You opened your eyes but felt different somehow, physically, like you were human again... You look up to see Master Kagaya (Mmhm, he survived too) with his wife Amane next to him, he had a kind but concerned smile, still clearly shocked you were indeed alive after all these years.