Striking Back at the Veins (An Eremin Fanfiction) [SNK/AOT AU]

In the early 23rd century, reports of an elusive shadowed figure killing relentlessly is all the media is talking about. They call it the 'Shadowstrike' and he saved my life. A year and a half ago my best friend Armin Arlert was kidnapped right in front of me. I assumed he was dead until the day I saw him under a dark...