球磨就是熊，那么穿上熊的服装也是很正常的；顺带着让她的妹妹们也穿上类似的动物服装。
Kuma also means a bear, so it's normal to wear bear costume; By the way, let her sisters also wear similar animal costumes.
球磨は熊だから、熊の服を着るのも普通だ。ついでに妹たちにも似たような動物服を着させた。