(On Hold, Rewritten soon)Captain Over Captain (Harlock x reader x Levi)

The earth used to be a thriving sanctuary for humans, where the only concern was the overpopulation issue. Until a new threat arose from the galaxy, drawn by the abundance of humans, an alien species far larger then any person, Titans. They came to earth in a large number of ships, and before anybody could comprehend what was happening, the majority of the earth's inhabitants were enslaved for the Titans consumption. However some ships managed to escape before the earth was taken. Most split off into their own community far away from earth, and out of the grasps of the new enemy. You're one of the many that became outcasted and left with no home besides the ship you reside on, the Survey Corps. While most humans hide from the Titans, you became part of a band of humans who want to take back earth and rid the universe of Titans. However, with pirates plundering rouge vessels and Titans hunting down the last remaining humans, will you succeed or be completely annihilated?