まるです。

別の部屋で段ボール箱を束ねようと思ったら、紐の先っぽをくわえて持って行かれてしまったので、
とりあえずちょっと遊ぶ。
I was going to bundle up cardboard boxes with a string in a different room.
However, Maru held the string in his mouth and carried it away.
Therefore we played first of all.

「ん？」
Maru:[ What? ]
ごめん、ちょっとイタズラ。
I’m sorry. I did a prank to you a little.