Titan ae and knights of Sidonia crossover.

This is a story about Nagate Tanikaze. He was born in 3023. Over the past century, humans have ventured out into space, far into the cosmos. And over time we always thought earth would be home...but we were wrong...and we had to leave to survive or die with our world. 15 years after earth, in a desperate hope to save both the human race and his universe nagate's last hope is the titan.