The Mysterious Prankster Who Appears and Disappears! Is the Culprit Korosuke?

Synopsis

Butagorira, Miyo, Benshiro, Tongari, and even Mama all come angry, saying Korosuke has been pranking them. No matter how much Korosuke protests, no one believes him. One day, Eiichi finds damage to the storage shed large enough for sunlight to pour through. Then it hits him—he'd kept a "tiny Korosuke" gadget in there the whole time!