It's usually an indication of hunger, indigestion, or a need to use the restroom.
Here by having Ryoma in a role like Shuichi's for Kaito's night training and the two having similar issues they are able to be on much better terms.
Bunga thinks the rumbling is Besthe's stomach.
With nothing better to do, they order a ton of food and pig out, gorging themselves to the point that they turn into massively bloated spheres that serve as the page image for.
Umaru-chan, it happens in episodes 1, 3, 8 and 11.
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