Maruko gets into a fight with her big sister over the tiniest little thing. Determined to make her sister eat her words somehow, Maruko begins plotting her revenge…
まる子はちょっとしたことでお姉ちゃんとケンカになってしまう。なんとかして、お姉ちゃんをギャフンと言わせたいまる子は…。
