An illustrated story with four sections featuring miyagawa atsushi, an 11-year-old boy who stands at 180 centimeters tall and has a mature appearance due to his build. despite this, he often faces difficulties because of his height. in contrast, his older sister atsumi, who is 17 years old and only measures 137 centimeters in height, has a youthful appearance and takes care of her younger brother as if he were still a child.