(Taken from LN Publisher's Summary)

Kamachi Kazuma 10th Anniversary! A large gathering of Kamachi's characters are set to make a novel appearance! Moreover, the adaptation of the story will be in Gangan Comics starting on the same month!!

One day, Kamijou Touma awakes to find a strange space in his room. There is also the mystery of the huge weapons called "Object" that has been fighting with a flying dragon, a shotacon fantasy Onee-san giving her aid, wandering together with Mikoto who is wearing bikini armor.... A large gathering of popular characters and heroines assemble from Kamachi's works to form a special novel!

Dengeki Daioh appendix booklet has all the illustrations! The Kamachi Kazuma BOX has the first part of the story and now the full version has now been released. List of works: Toaru Majutsu no Index, Heavy Object, The Zashiki Warashi of Intellectual Village, The Marriage Circumstances of Waltraute-san, the Simple series, Killer Princess and Deep End, and others.

Related:

> Crossover (Light Novel)
( https://www.baka-tsuki.org/project/index.php?title=Toaru_Majutsu_no_Index:_New_Testament )

> Anniversary Anime Short
( https://www.youtube.com/watch?v=Y8ZCp7FnD3w )