It takes one joke, a fifth-grader built like a construction foreman and a high schooler the size of a kindergartner, and refuses to blink. Atsushi is eleven, and every adult in frame reads him as a threat, a creep, or a guy who should be at work. Atsumi is seventeen, and everyone treats her like a lost child who needs walking home. The comedy runs on that gap and nothing else, which is exactly why it splits a room: no arcs, no stakes, no escalation, just deadpan sibling domesticity and the world getting it wrong again. These two are the episodes that never aired, tucked into the special edition of volume four for readers already fluent in the bit. If you found the premise funny once, you will find it funny for its entire runtime. If you did not, nothing here is going to argue with you.
Satou Atsushi is a fifth-grader caught in an awkward predicament: he's grown to be taller than most adults, making every school day an exercise in physical comedy and social confusion. Classmates tower over him in spirit but not in stature, and teachers do double-takes when this impossibly tall child walks through the classroom door. The gap between his appearance and his actual age creates constant friction with the world around him. His sister, a kindergartener, faces the opposite problem. She's remarkably mature for her age, speaking and acting like she's far older than she actually is. Together, they navigate a world that refuses to see them for who they really are. The show mines humor from every awkward situation their mismatched physical appearances create: mistaken identities, confused strangers, and the simple reality of trying to fit in when your body refuses to cooperate. It's absurdist comedy built entirely on the joke of perspective and expectation versus reality, wrapped in a family dynamic that makes the premise repeatedly entertaining rather than one-note.