|Index: "What is this? Agathions?"|
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The first chapter of Toaru Idol no Accelerator-sama was released on October 27, 2015 in Dengeki Daioh.
- Kamijou Touma (flashback)
- Last Order
- Yoshikawa Kikyou
- Kakine Teitoku
- Misaka Mikoto
- Yomikawa Aiho
- Sister clones
- Estelle Rosenthal
- Touma's fight with Accelerator from the 3rd novel, which ended the Level 6 Shift Project is referenced. It's end directly results in the Miracle Idolization Project.
- The man who approaches Accelerator for the Miracle Idolization Project is similar to the one that appeared in Accelerator's flashback in Railgun manga chapter 37 and is later adapted in the 13th episode of the Railgun S anime.