Toaru Majutsu no Heavy na Zashiki Warashi ga Kantan na Satsujinki no Konkatsu Jijou

A spin-off featuring characters from multiple works by Kamachi Kazuma. Kamijou Touma from *A Certain Magical Index* encounters a mishap when his toilet breaks and floods his room. While dealing with the situation, he and Index, along with Misaka, are transported to an unfamiliar location. Additional unfamiliar individuals soon appear as well. The story incorporates elements from *A Certain Magical Index*, *Heavy Object*, *The Zashiki Warashi of Intellectual Village*, *The Circumstances Leading to Waltraute's Marriage*, *A Simple Survey*, and *A Simple Monitoring*.