Comprehensive Manga: Life Starting from Demon Slayer

[Comprehensive comic + system + time travel + changed plot] Spiritual energy revives and demons invade. Underneath the calm, the forces of all parties are turbulent. Lu Ya awakened his superpower and joined the Demon Hunter in order to take over the responsibility of his family and protect his country. However, he was attacked during a mission and when his life was in danger, the system awakened and gained the ability to travel to different worlds. The first world: "Demon Slayer" The second world: "JoJo's Bizarre Adventure: Star Expedition" The third world: "The Red Eye" …(to be added later)