The Circumstances Leading to a Simple Killer Princess's Marriage Was A Certain Magical Heavy Zashiki Warashi

A spin-off of the various works of Kamachi Kazuma. One day, Kamijou Touma (A Certain Magical Index) faced yet another misfortune. His toilet was broken and spraying water everywhere. As he was lamenting his misfortune, suddenly he appeared in a strange place along with Index and Misaka. Soon enough, more strange people begin appearing...

Includes:

Toaru Majutsu no Kinsho Mokuroku (Novel)
Heavy Object (Novel)
Interibirejji no Zashiki Warashi (Novel)
Waltraute-san no Konkatsu Jijou (Novel)
Kantan na Monitor desu (Novel)
Kanta na Enquete desu (Novel)
Killer Queen and Deep End (Novel)
Mitou Shoukan://Blood-Sign (Novel)