Kami no Tou: Ouji no Kikan

Years after Bam began climbing the Tower, the journey shifts to the 20th floor, where Ja Wangnan keeps attempting the advancement test despite repeated failures and mounting debt. His dream of reaching the top and becoming king of the Tower is much larger than his current strength, but he refuses to abandon it.

On another attempt he meets Jyu Viole Grace, an immensely powerful and mysterious fighter connected to the criminal organization FUG. Wangnan needs strong allies to move forward, while Viole wants nothing to do with a team. As harsher tests and new Regulars bring their goals together, persuading this isolated man to join them becomes the first step toward a deeper question: what happened to Bam, and why does Viole seem tied to a past he refuses to face?