Multiple worlds + no heroine + demon slayer + time travel + system
(The system has no autonomous consciousness, it is just a tool, and it relies more on the protagonist's efforts)
World: Demon Slayer (Ongoing)
By chance, Li Xingzhao was chosen to be an actor in the universe. With his powerful talent (wai) and steady character, he successfully became a being that transcended the world and left his story in the universe.
Kibutsuji Mukai: I can't come, he yelled about friendship and bonding, and then he rushed up and said he wanted to drag me to bask in the sun!
Why did you send it? (Sad)