In one of her usual passing fancies, Maruko suddenly announces that she wants to take ballet lessons. Hearing that vinegar makes the body more flexible, she decides to try drinking some. But all it does is make her feel sick, without making her any bendier. When she realizes she’d even have to give up her beloved hamburgers, she gives up on ballet with remarkable ease.
またいつもの気まぐれで、バレエを習いたいと言い出すまる子。カラダの固いまる子は、お酢を飲むとカラダが柔らかくなると聞き、やってみることに。けれども気分が悪くなるだけで、一向に柔らかくならない。大好きなハンバーグも食べられないのイヤだと簡単に諦めてしまう。