Speaking practice

I noticed the a e i u e o a o, ka ke ki ku ke ko ka ko drill in Hitohira but didn't give it much consideration beyond that it might help stage actors speak clearly over a large distance, sans amplification. In keeping with her character it might have been a well known beginner's exercise that Nono picked up from her Drama Club days, which she was now imparting with the efficiency of a drill sergeant.

Of course that doesn't preclude it from being useful to children. Well now I know, and knowing is half the battle.