Here is the summary of the book:
Miyagawa Atsumi and her younger brother Atsushi are your typical siblings - she's a high school sophomore dealing with exams, he's a 5th grader who only wants to run off and play with his friends. School's hard enough as it is, but things are even tougher for these two: Atsumi is so tiny she's still mistaken for a little kid, while Atsushi is so tall people assume he's a full-grown man!
Yonkoma. This is 4 cell manga styled quite different from your regular manga reaing of back-front and right to left. But read in the order of top to bottom. The story looks to siblings Atsumi and Atsushi. Older sister Atsumi is a sophomore in High School and younger brother Atsushi is a fifth grader. Although she is older, she has the body of a kid and he the 5th grader, that of a full grown man is often mistaken to be an adult.
This leads to loads of hilarious misunderstandings regarding Atsushi that ends him in prison mistaken for a pedophile walking with his sister or his peers because they are tinier than he is ..... And there you go that is the point to this volume and we get many repeat performances of it. It is quite hilarious at first but then after sometime becomes monotonous and doesn't really bring us to laughter much.
I lost interest after sometime and leaved through till the final cell ...... Its name is actually Recorder & Satchel (which makes more sense) and I don't see what the need was for changing the name to Recorder and Randsell.