Continuing in the series, Power of the Hearts, Sera Kaiba and her group of friends are on their way to the semi finals for Battle City Tournament. But as usual, they bump into trouble along the way. First a Virtual world and having to deal with Noah and once again, the Big Five. And Second, Marik during the tournament. Hopefully they will get through all of this.

Duelist Kingdom is now behind Sera and the gang. More mysteries about to unlock for Yami and Sera as Battle City arrives.

Everyone, meet Sera Kaiba, Seto's twin sister and Mokuba's older sister. She loves her brothers more than anything. For the past year, she's been in Egypt where she found a special item. The Millennium Crystal that once belonged to a Queen. When Seto leaves, Sera is asked to join a tournament where she meets Yugi and the gang. What will happen when she meets her past life's Pharaoh?