Osamu Ryuji is a mathematician. Ryuji is a boy who is quite famous for his intelligence, he received many medals and trophies cause he often took part in Olympic competitions. It's not surprising that the majority of his medals and trophies are golds, because he often comes first. Not only clever, Ryuji is also a boy who is very obsessed with cleanliness and good looks, he is very popular at school and in his environment because of his appearance and his brain.