Schuld 
Min-Maxing My TRPG Build in Another World: Volume 8 [EPUB ebook] 

Erich and Margit have settled into their lives as adventurers in Marsheim, having risen to ruby-red rank—another firm step forward in their adventuring careers! However, as the dust settles around the incident with the Baldur Clan, Nanna makes them an interesting proposal. As suspicious a character as she seems, this might be the perfect opportunity for Erich to make some new allies… This gold-haired newbie adventurer’s real journey is just getting started!