it also had a crossover with many other franchise, like SMT SRW and Code Geass https://youtu.be/-qKLX4FaEfk Chain Chronicle https://youtu.be/UC54LctGYpE Girl Gun Cafe https://youtu.be/GTKO_6nafg4 Yuyuyu Date a live https://youtu.be/gJ7XdyaC-d8 Extraordinary Ones https://youtu.be/hmJqM4m_n7Q Lunatia https://web.archive.org/web/20091208170035/http://game.goo.ne.jp:80/news/items/2009111302luna.html Shironeko Tenis https://www.reddit.com/r/gachagaming/comments/t8l73b/shironeko_tennis_x_toaru_majutsu_no_index_iii/ Crash fever https://youtu.be/SMHt1kO7FGg Divine Gate https://divine-gate.fandom.com/wiki/To_Aru_Majutsu_No_Index_Collaboration_Event Last Period Bang Dream https://www.reddit.com/r/toarumajutsunoindex/comments/hae1td/official_key_art_for_the_bang_dream_railgun_t/ There is also a gacha rpg where Accelerator was a boss but I can't remember. Dengeki Bunko Fighting Climax, Crossing Void and Venus are crossovers of the entire Dengeki.