'''Shoma Yusa''' ({{Ruby|遊|ゆ}}{{Ruby|佐|さ}} {{Ruby|尚|しょう}}{{Ruby|磨|ま}} ''Yusa Shōma'')<ref>{{chapter|Yu-Gi-Oh! OCG Structures|2|ref}}</ref> is the main character of the ''[[Yu-Gi-Oh! OCG Structures]]'' manga. He is a soft-spoken and shy boy who only recently moved to the big city at the invitation of his big older sister [[Ageha Yusa|Ageha]], but is more than ready to throw himself into the card game he loves.