Kamijou Touma Visits Another World (上条当麻の異世界訪問 Kamijō Tōma no Isekai Hōmon?), full name Special Collaboration Conte Kamijou Touma Visits Another World (特別コラボ掌編 上条当麻の異世界訪問 Tokubetsu Korabo Shōhen Kamijō Tōma no Isekai Hōmon?), is a crossover short story written by Kamachi Kazuma. The six parts of the story were temporarily uploaded in pairs to Kamachi's 10th Anniversary Website, with each pair replacing the former weekly from December 1st to December 22nd, with subsequent release with the first Heavy Object anime adaptation BD/DVD releases.
The crossover short story features the protagonist of Toaru Majutsu no Index series, Kamijou Touma, visiting the world of Heavy Object and meeting characters of the four different factions: Quenser, Heivia, Milinda, and Froleytia from the Legitimacy Kingdom; Mariydi Whitewitch from the Capitalist Corporations, Putana Highball from the Faith Organization, and Oh Ho Ho and Lendy Farolito from the Information Alliance.
- Prologue: Kamijou Touma Visits Another World
- Chapter 1: Legitimacy Kingdom
- Chapter 2: Capitalist Corporations
- Chapter 3: Faith Organization
- Chapter 4: Information Alliance
- Epilogue: The Conclusion