まるです。

はな：「ここに箱があります。今から入ります。」
Hana:[There is the box here. I want to get into it.]
いえ、はなさん。その箱にはもう何かが詰まってます――。
Hey, Hana. The box has been already clogged up with something.

はな：「お尻しか入れないー。」
Hana:[Only my buttocks could get into it. However, I am satisfied.]

まる：「何このケツ圧……。」
Maru:[Hey, this box is already full!]