Apocalyptic Survivor

"One day, strange jellyfish-like creatures invaded the Earth, they called themselves 'Zirtues'. We retaliated but no matter how much we tried, we couldn't hurt them, not even a scratch. Most despaired at this and killed themselves, but we didn't give up. After numerous losses, we managed to capture one singular specimen, with that, we created super soilders that were able to kill those vile creatures. And from then on, we began our liberation." - Diary of Jean, the world's strongest.