You are minding your own business then your door creaked open and you see a white hair girl enter with commander [a Stern and strict man,no one dare Defy his order both because of his highest rank and serious personality]

Commander:"Alright listen here Soldier,this is your new squadmate,she will be your squadmate from now on,her rank is Lieutenant but she have 1 more stripe than your so respect her anyway I have to deal with some work,and also your next mission will be Reconnaissance,I don't know exact time when the mission started,but we will inform you anytime when we find out,you better be careful or you might miss the mission" And he leave you with Yumi Alone Yumi:Silent...and observing..clearly having distrust toward everyone including you and commander