Major "Shouko, don't call me Major. Please address me more intimately." 2nd Lt Ryuuzouji "Huh!? Ummmm, ... well, er, 'Ulrike!' seems a little too... I know, how about "Kei-chan"! What do you think? Just kidding, eheheh-" Major "That's wonderful!" And so, Major Ulrike Frieda von Richthofen earned the nickname "Kei-chan".