The nine Mercenaries, who have long worked as relentless engines of war at TF Industries and and Mann Co. with their signature brutality, are now forced to deal with the unique nature of Kivotos' students through a new program initiated by Mann Co. itself. Can they truly become "Sensei" to these halo-bearing, heavily armed students? What kinds of absurd adventures await the Mercenaries in a place utterly alien to them-the city of student, Kivotos? Let's follow their excitement and chaos in Menacing Mercenaries Mashup! == A FanFic crossover story of Team Fortress 2 and Blue Archive ==