Hazure Skill: The Guild Member With A Worthless Skill Is Actually A Legendary Assassin, Vol. 4 LN

Roland is the Adventurers Guild's ace in both name and deed, and a formerlegendaryassassin. For his next quest, he is sent to help rebuild theHadenberg Kingdom, whichhas been torn apart by war with the demon lord'sarmy. There's far more waiting forhim than a normal guild assignment,however. Someone is scheming to kidnap a queenthat Roland just happens tohave met before...