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In a four-panel manga, Miyagawa Atsushi plays the role of an 11-year-old boy who is constantly in trouble due to his 180-centimeter height and mature physique. Fortunately, his 17-year-old elder sister Atsumi, who appears youthful despite being only 137 centimeters tall, is always on hand to look after him since Atsushi hasn't outgrown his childish behavior.