2024, the apocalypse descended upon Earth. Unfortunately, it wasn't a normal apocalypse but one where the zombies could evolve and get stronger. Although the humans of Earth were assisted by a System that helped them grow stronger, the sheer numbers of zombies in the world caused humanity to almost become extinct within 10 years. After 10 years, he was one of thge last 74 survivors in the world, but he was unlucky and was caught by a Stage 25 zombie and directly smashed to pieces and devoured. Shockingly enough, after his death he was sent back in time 10 years ago, to the day it all started. He would once again survive this hellish world, but this time he would be the strongest! Just... Why has his gender changed?