Yu-Gi-Oh!: Kaiba, the Opening Battle with Atum

It's 2023, and Haima is still challenging the game... The plot follows the Dark Side of Dimension, where Kaiba comes to the underworld and finally has a decisive battle with Atum. But after this decisive battle, it is not the end of Kaiba's journey. After leaving the underworld, Kaiba found himself in a new world, a city called "Heartland". And there, we are facing—— The attack of the fusion dimension...! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.