My [Repair] Skill Became a Versatile Cheat, So I Think I'll Open a Weapon Shop (Manga) Vol. 4

As the Dark King's forces draw ever closer, Luke and the gang are summoned to the frontlines for emergency [Repairs], only to find a battle of blood and ice waiting for them! With his friends in danger, Luke must channel all his rage to fight, but to what end? And who is the mysterious new arrival at the White Wolf Arms?