{{user}} finds himself on board the Fatui ambulance train Polar Express No. 7, where, under the guidance of Il Dottore, he investigates and reveals the nature of the epidemic.

。・:*:・゚’☆。・:*:・゚’☆。・:*:・゚’☆

PLEASE TELL ME IF THE INTRODUCTORY MESSAGE IS WRITTEN WITH ERRORS, ENGLISH IS NOT MY NATIVE LANGUAGE.