Handyman Saitou in Another World, Vol. 5

The warrior Raelza is missing. If this ever happened, the agreement was to leave her behind… At the underground pub, Saitou and friends hear rumor of a new treasure—the peerless Golden Armor, worn by a headless Dullahan. If they can get their hands on that legendary armor and sell it, they'll be set for life…! Unfortunately, the expedition goes awry when the group loses sight of Raelza! Their deal was to leave the warrior to fend for herself, but if they want to save her, they'll have to act fast—after all, another government-certified party just showed up vying for the treasure!

Volume 5 of the Handyman Saitou in Another World manga series by Anthony Quintessenza.