The first chapter of the Toaru Kagaku no Dark Matter manga was released on August 27th 2019 in Toaru Kagaku no Accelerator × Toaru Kagaku no Railgun Toaru Magazine.
- Kakine Teitoku meets Yuzuriha Ringo
By order of appearance:
- Kakine Teitoku
- Gokusai Kaibi
- Yobou Banka
- Last Order
- Esther Rosenthal
- Kuroyoru Umidori
- Kihara Amata
- Dark Matter - Kakine Teitoku, Level 5
- Telekinesis - Yuzuriha Ringo, Level Unknown
- The entire chapter acts as a callback to Accelerator and Last Order's meeting as depicted in Chapter 27, Chapter 28, and Chapter 29 of the Index manga, following similar beats:
- A Level 5 meets a young girl at night.
- He allows her to sleep at his place.
- The next day, the Level 5 treats the young girl to a family restaurant.
- The Level 5 later leaves the girl where she is promptly accosted by her enemies.
- The Dark May Project was first mentioned in Toaru Majutsu no Index Light Novel Volume 15. Kuroyoru Umidori's role in killing all the researchers involved is also mentioned.
- The cameo of Accelerator, Last Order, and Esther Rosenthal indicates that the chapter takes place during the early parts of the Necromancer Arc. In particular, it takes place between Chapter 2 and Chapter 3 of the Toaru Kagaku no Accelerator manga, as indicated by Last Order's mention of the family restaurant.
- The headless statue on the cover is Nike of Samothrace.
- Galette is a flat round cake of pastry or bread in French cuisine.
- Who is the girl shown in Yuzuriha's dream?