とある魔術の禁書目録
Four side stories are released for "A Certain Magical Index", "A Certain Magical Index II", "A Certain Scientific Railgun", and "A Certain Scientific Railgun S" anime series' limited-edition Blu-rays and DVDs. "Toaru Majutsu no Index: Road to Endymion" light novel is given to the first 103,000 viewers of "" film. "Toaru Kagaku no Railgun: Cold Game" light novel was released with the February 2018 issue of "Monthly Comic Dengeki Daioh". They were later collected into two volumes in 2020 to commemorate the 15th anniversary of Kazuma Kamachi's debut.