The Eminence in Shadow Series by Daisuke Aizawa, 逢沢 大介, Touzai

ONE BIG FAT LIE AND A FEW TWISTED TRUTHSEven in his past life, Cid's dream wasn't to become a protagonist or a final boss. He'd rather lie low as a minor character until it's prime time to reveal he's a mastermind...or at least, do the next best thing-pretend to be one! And now that he's been reborn into another world, he's ready to set the perfect conditions to live out his dreams to the fullest... moreONE BIG FAT LIE AND A FEW TWISTED TRUTHSEven in his past life, Cid's dream wasn't to become a protagonist or a final boss. He'd rather lie low as a minor character until it's prime time to reveal he's a mastermind...or at least, do the next best thing-pretend to be one! And now that he's been reborn into another world, he's ready to set the perfect conditions to live out his dreams to the fullest. Armed with his overactive imagination, Cid jokingly recruits members to his organization and makes up a whole backstory about an evil cult that they need to take down. Well, as luck would have it, these imaginary adversaries turn out to be the real deal-and everyone knows the truth but him! less

NOTHING COULD BE FURTHER FROM THE TRUTHCid pays a visit to the Sacred Land, where he finds himself getting roped into the Goddess's Trial. It's a ritual event that summons warriors from the past to engage with only the most worthy from the present. When Cid squares off against the witch who brought devastation to the world, the door to the Sanctuary creaks open, granting the Shadow Garden valuable insight into the possessed and the Cult of Diablos... moreNOTHING COULD BE FURTHER FROM THE TRUTHCid pays a visit to the Sacred Land, where he finds himself getting roped into the Goddess's Trial. It's a ritual event that summons warriors from the past to engage with only the most worthy from the present. When Cid squares off against the witch who brought devastation to the world, the door to the Sanctuary creaks open, granting the Shadow Garden valuable insight into the possessed and the Cult of Diablos. That is until Cid, blissfully ignorant of the conspiracies playing out behind the scenes, runs amok! less

THE RED MOON HANGS LOW IN THE NIGHT—AN OMEN OF WHAT’S TO COME​Deep within the Lawless City lies the Blood Queen, a Progenitor Vampire, slumbering in her coffin for many moons. An expert at landing himself in trouble, Cid should know better than to go after her…but he’s dying to get a piece of the action. It’s time he shed his daytime persona to take on the role of Shadow! It seems, however, that he’s not the only one with this idea... moreTHE RED MOON HANGS LOW IN THE NIGHT—AN OMEN OF WHAT’S TO COME​Deep within the Lawless City lies the Blood Queen, a Progenitor Vampire, slumbering in her coffin for many moons. An expert at landing himself in trouble, Cid should know better than to go after her…but he’s dying to get a piece of the action. It’s time he shed his daytime persona to take on the role of Shadow! It seems, however, that he’s not the only one with this idea. Soon enough, he finds the three rulers of the Lawless City—Juggernaut the Tyrant, Yukime the Spirit Fox, and Crimson the vampire—are all on his tail. To complicate things even further, the Shadow Garden descends on the scene as the hour of the Blood Queen’s awakening looms closer and closer… less