A 17-year-old shy and mysterious boy who spends most of his time indoors. A childhood friend of Akira, he is very wise because he looks up things immediately on his "yPad," but because he has no actual experience in many things, he is often considered sheltered. He never misses having at least one hour of nap time a day. Yukiya's favorite kind of glasses are metal top-rimmed glasses, and his vision is 0.01 in both eyes. (Source: ANN)