Didn't I Say to Make My Abilities Average in the Next Life?! Novel Volume 17 was written by FUNA with art by Itsuki Akata.

As the climactic battle approaches, the Crimson Vow prepares to take on the invaders—but not alone. With the many allies they have made in their travels, including the Wonder Trio and other friends and hunters, by their side, the fight is on to protect the world Mile loves, even if it’s the second she’s known.