To Reminisce

Basically an Ereri story, set in the Tokyo Ghoul world.
Eren is a 16 year old boy, dating a 19 year old boy named Levi. They're happy and sappy before Levi goes missing. Eren is heartbroken and goes on a search for a whole year, with no luck. After two years though, Eren is cornered by a group of bloodthirsty ghouls. What will happen and who will help?