Update: Volume 4 was released, and the manga adaptation started serializing since May 2023.

> LN VOLUME 4 Cover Illustration

Release Date: May 18, 2023

Quick info about the manga adaptation:

Story & Art: Mimori Tsukahara (“Re:ZERO -Starting Life in Another World- The Frozen Bond” Manga)
Start Date: May 18, 2023
Status: Ongoing (5 chapters)
Magazine: MangaUp (Square Enix)

Synopsis: Amidst a turbulent era, the kingdom of Amelia, led by Queen Amelia, holds a monopoly on the extraordinary power of 'magic' and relentlessly invades other countries. Meanwhile, the prosperous small nation of Campus Fellow thrives on farming and blacksmithing but now teeters on the edge of war.

In a desperate bid to ensure the survival of their nation, Lord Bud Grace devises an unconventional plan. He resolves to assemble a group of wicked “witches,” known for their terrifying tales and catastrophic powers, to join his cause. Among them is a boy raised as an assassin, known only as the “Black Hound,” equipped with a deadly arsenal of killing techniques. Despite the perilous nature of the strategy, he willingly dedicates himself to protecting his country and his lord.

1st chapter is available for free (JP):
Manga UP | Author's tweets