the premise is similar to the novel Welcome to the Impregnable Demon King Castle but the difference is that the demon lord the MC gets employed to dint have a vampire maid.....she and the MC takes down a dungeon and then build it again as their base....the Hero party attacks and loses horribly losing the divine buffs, while the Mercenary assigned to them becomes another member of the demon lord's team.....
how is it that i forgot the name of something i bookmarked, and even looked for before making the thread, baffles me to no end.... -___-