The Eminence in Shadow, Vol. 11 (manga) — Daisuke Aizawa

Upon arriving at the Oriana Kingdom, Cid is blindsided by the news that Princess Rose is set to wed Duke Perv! This unexpected plot twist throws a major wrench in Cid's future plans -- after all, the brighter the light, the darker the shadows, and Cid had been counting on Rose to illuminate the world for him. It seems like it'd be a good idea to crash the party and get the deets about what's going on, but are there even bigger schemes at work behind this unholy matrimony?