Kill the Ghost with a Broken Sword! in Demon Slayer, I Wear Through the Twelve Ghost Moons

Fourteen-year-old Chiba Makimura lost everything in a blizzard night in Feixue Village - the evil ghost "Frozen Bone" killed his sister Yukiyo and sister Yukimi, but awakened the system in his body when he was about to die. Pseudo-natural transparency + self-created breathing + nine-pillar survival I will dismantle the original CP. If you are advised to do so, read it carefully. (Time travel, but the relevant memories are mixed into the memory bank by the system, and relevant events need to be triggered to light up the memories and unlock them)