Hiraki and Serena are childhood friends and have deflected from Academia after learning its true goals. However, Hiraki has presumably been taken away by them after losing a duel. To save him, the Lancers have to make their way to the Fusion Dimension but this will be no easy task due to the Unifiers of Chaos standing in their way, pursuing the 2 remaining Dimensional girls.

After a virus killed most of humanity with the exception of children, Kazuma is faced with the threat of vampires ruling the world and ending mankind. With new allies and friends in his way, can they prevent the annihilation of the human race, or will the vampires succeed in enslaving all human beings? Join Kazuma as he prepares to face his greatest enemy and family, his brother.