Infinite Dendrogram Novel Volume 12 features story by Sakon Kaidou and art by Taiki.

Gideon, City of Duels, is bustling with life! A great celebration is underway, and a grand duel is about to take place. At Azurite's behest, Ray accompanies Xunyu on an escort mission to the great City of Duels. Meanwhile Hannya, the devilish berserker, is finally freed from the Gaol. She has only one thing on her mind: visiting her beloved (and oblivious) Figaro! Thus Gideon becomes the backdrop to the convergence of many stories, and many forms, of love.