Cid Kagenou spent his previous life obsessed with becoming a shadowy mastermind who pulls strings from the background, only to die and reincarnate into a fantasy world with real magic. Treating the new world like a stage, he founds a secret organization called Shadow Garden and invents an enemy, the Cult of Diabolos, to give his group a purpose. The joke turns serious when the cult turns out to be real, and Cid's improvised heroics accidentally dismantle an actual conspiracy while he believes he is just roleplaying.