Summoned to a different realm, Nagi gains the unique 'Skill Structure' ability. Sensing ominous undertones in the king's mission to vanquish the Devil King, Nagi departs the castle alongside a slave girl. His companions include Cecyl, a pint-sized demon, Rita, a beastly melee fighter, Aine, the elder sister maid, Regii, a cursed sword, Rafiria, a gentle elf, and Iris, a sea dragon shrine maiden. Nagi enhances the girls' abilities, transforming them into formidable 'cheat characters' through his skillful rewrites.