Хулиганите често си набелязват за жертва крехки и слаби хора - точно като Юги Муто. Той цени своя Хилядолетен Пъзел, древна Египетска реликва, която е донесена в игралния магазин на дядо си. Вярвайки, че като нареди пъзела ще му се изпълни желанието, нареждайки пъзела, той отключва нова самоличност - духа на "Кралят на Игрите". Новата самоличност, наречена Ями Юги, е точната противоположност на Юги. При всяка несправедливост към него, Ями Юги превзема тялото на Юги и предизвиква опонента си на "Игра на сенките".
Izumi was born in a family of celebrities. His father is a singer, his mother an artist, his older brother the lead vocalist for the popular band Crashers. Izumi himself, however, is just a nerdy college student. He loves the manga "Magical Girl Lala Lulu" and dreams of becoming a manga writer himself. One day he is roped into filming a commercial where he wears a dress. Another actor on the set, Ryoma Ichijo, mistakes him for a woman and falls in love at first sight. As it turns out, though, they met ten years in the past. And Ryoma feelings don't change when he finds out Izumi is a boy.
Kang Woo Hyun is a respected anchor at a broadcasting station. He is a devout and happy father, who enjoys being surrounded by his charming family. He decides to try his luck in politics. One day, on a trip he makes with his family, a tragic incident happens. Meanwhile, Go Dong Kook, a veteran detective, who doesn't stop at anything until a case is solved, decides to take the case of Kang Woo Hyun and sets out to investigate what lies behind the tragic incident.
The story begins when the reserved Shizuka attends a local mixer party but has trouble adjusting to the atmosphere. A beautiful older female college student named Ryou starts talking to her, and the pair hit it off. Shizuka goes to spend the night at Ryou's place. However, Ryou unexpectedly kisses Shizuka and pushes her down. Shizuka thinks the beautiful woman is a lesbian but soon discovers that Ryou is actually a man dressed as a woman.