Niko and Yukino had to stay for their mission, but they still manage to send off Kurumi and Otogi to school trip :-)
ps - Mama Niko being mama Niko to Rabbit platoon too

ニコとユキノは任務のため残らなければならなかったけど、それでもくるみとおとぎを修学旅行に送り出すことができた :-)
追伸 - ママニコはウサギ小隊にとってもママニコだね