Recorder to Randoseru Do♪

Atsushi Miyagawa is an 11-year-old boy with the appearance of a fully-grown man. His 17-year-old sister, Atsumi, has the stature of a child! From Atsushi being arrested numerous times as a suspected predator to Atsumi constantly grabbed like a small child more times than she can count, many things go wrong for this curious sibling duo. Atsumi's classmate is even in love with Atsushi, oblivious to his true age! Despite all this, indeed, there is not a single dull moment in the Miyagawa household. Miyagawa Atsushi is an 11-year-old boy. Since he is 180 centimeters tall and has a grown-up looking build, he has always been running into troubles. On the other hand, his 17-year-old elder sister Atsumi is only 137 centimeters tall and has a childish looking build. Atsumi takes good care of Atsushi, who acts his true age.