Demon Slayer Becomes Invincible from the Moment He Becomes a Ghost

Huh? Traveled through time? Zihe looked around blankly and found that this place was different from his original world. "Have I traveled to the world of Demon Slayer?"... When he was thinking wildly, "Ding, found the host, congratulations to the host for binding the treasure box system." Well, this is the benefit of time travellers. Um? How did I become a ghost? "Host, this is the reward of the system" "I*, I don't want this reward from the system" "No, host. If you don't accept rewards, the system will automatically exit and erase the host." I couldn't help but break into a cold sweat, "Forget it, I can become the strongest even if I become a ghost." Just like that, I started my journey of killing ghosts This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.