Promises to keep

As the years go by Titans have been appearing less and less. Humanity has gone months without seeing one. All seems fine, Levi and Eren's love is blooming, then it happens. People start getting sick left and right with a deadly illness causing a huge decrease in the population.
-some signs are coughing, vomiting and passing out-
This is a story about humanity fighting yet another fight and Eren and Levi keeping their love alive, blood pumping and eyes open.