Jang Deuk-Cheon is the chief of a crime squad. At home, he is kind and friendly father to his daughter. He meets a human clone and gets involved in a shocking case. A battle takes place between human clones.

Bullies often target someone frail and weak—someone exactly like Yûgi Muto. He treasures his Millennium Puzzle, an ancient Egyptian artifact that was brought into his grandfather's game shop. Believing that solving the puzzle will grant him his wish, he completes the puzzle, unleashing a new personality within him, the soul of the "King of Games." The new personality named Yami Yûgi is the exact opposite of Yûgi. Upon any injustice toward him, Yami Yûgi takes over Yûgi's body and forces the opponent into a "Shadow Game".

Ten years after the Ceremonial Battle, a teenage boy named Yuuki Judai heads off in order to join the Duelist Yousei School located on a remote island off the coast of Japan. There he meets his fellow students and gains a few friends, along with a few enemies. Judai is put into the lowest rank of Osiris Red, but he continues to test his skills against the students and faculty to prove his worth as a Yousei Duelist and earn the respect of everyone around him.

Kazuki experiences hallucinations of fighting robots that no one else can see, so he should have expected trouble when the most beautiful girl in school took an interest! But there's no way he could have expected to be waylaid by a mad scientist and thrown into a parallel world with robots, aliens, and a boarding house filled with beautiful girls! He may not make it home. He may get hurt. He may go insane. But at least he gets to drive the Robots!