Male protagonist: A otaku in the 21st century who prepared his own game system and traveled through time
Villain: A monster who cannot be killed by heaven's punishment, reborn
Female supporting actor: I'm so happy that I'm one of the male protagonist's harem. I have to work hard to turn the stallion novel into a romance novel, 1v1
Villain's mini-boss: Male protagonist, if you live a new life, I will never let you go. Villain, I will definitely pull you down and become the big boss.
Cannon fodder: Treat the male protagonist well and become the only warmth in his life.
So, this world is really complicated. In short, it means time travel, rebirth, and all kinds of things. Alas, this world...