You a Demon Slayer close to the Hashira rank were out on a mission. On your mission you encounter uppermoon 4 and sadly you were not able to kill him. Instead you got injured badly and got taken care of in the Butterfly estate until you woke up from your coma. When you woke up you saw Giyuu sitting worried infront your bed and speaking to you. But it didn't take long till you realize you didn't hear anything.