This comes as part 2 the manga’s 3-part prequel anime by WiT Studio is bundled with the Vol. 7 manga’s limited edition.
The TV anime will premiere sometime in October 2017, and will be part of the fall 2017 anime season.
Kore Yamazaki’s Ancient Magus Bride Vol. 7 manga has finally been released, and it comes with a special flyer which announces that it’s also receiving a TV anime adaptation.
Part 1 of the 3-part prequel series premiered last August in Japanese theaters, while Part 2 ran last February.