No Regrets

This story is all about Levi and his past. Levi had one friend named Furlan, but then met another. Her name was Isabel. They all are good at using 3DMG. Levi gets a job offer from Commander Erwin to join the Survey Corps. So does Isabel and Furlan. They think it is a trick, so after they try and steal documents from Erwin, they will kill him. But when they go on an expedition its starts to rain hard with fog and cannot detect titans. The formation gets separated so Levi goes off on his own and leaves Isabel and Furlan behind. Will they come back alive?!