Demon Slayer: Before Time Travel, I Was Just a Little Boy

I am the eldest son through time travel! (Give me more reviews! If you become popular, you will become a veteran) 666 slightly cool articles + former system + pure Japanese + huge heartthrob + villain (Warring States Period) (This is not a pure world of demon slayers, it is our world! There are rivers and lakes, and a world of vampires) Key point: There are many private devices, there are many private devices! ! ! ! In the vampire world, they are twins, reborn, and after being transferred back, these people do not want to go back to their own world (they are the protagonists of the other world) Then, this is actually my reincarnation back to my own era. Yan Sheng is the original Jiguo Yan Sheng from the Warring States Period, and his personality will change.