
Also some interesting trivia from Kawanami Eisaku’s comments:
Apparently, they wanted someone Sousuke can act like a baby brother to who he can be relaxed and frank with at home, since he’s been so tense from his shoulder injury, and he’s not the kind to show his weakness to Ai and Momo who are his underclassmen, or Rin since they are rivals. Thus his older cousin Kazuma was born. And Asumu is deliberately named so that she’s “a girl with a boy’s name,” just like Gou.

