Chapter 10 of Toaru Kagaku no Railgun Gaiden: Astral Buddy was released on March 27th 2018.
- The ghost girl sees the circumstances of Hokaze Junko and Shokuhou Misaki's first meeting in a memory.
By order of appearance:
- This chapter confirms that the Indian Poker card affecting Misaki was the malicious one that she was weary of.
- This chapter confirms the blood relationship between Yumiya Iruka and Yumiya Rakko; they are siblings with the former being the younger while the latter is the elder one.
- The flashback shows that Misaki didn't take over all of Clone Dolly, just those involved with the Exterior Project.
- Junko, Rakko, Iruka, and Ayu's past in Clone Dolly, a facility first referenced in the third Toaru Majutsu no Index light novel and explored in Chapter 60 of Toaru Kagaku no Railgun is shown here.
- The experiments on Junko gave her cluster headaches, an illness that is said to be one of the most painful and is known as suicide headaches.
- Who is the Level 5 that Ayu said that Ideal was able to raise?
- Is the girl shown at the end the ghost's true identity?
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