The Rising of the Shield Hero by Aneko Yusagi

The Heavenly Emperor of Q’ten Lo is after Raphtalia’s life! To ensure her saftey, Naofumi must team up with the country’s revolutionaries to overthrow him! But when they go about fixing the problems of the country’s misrule, it drives the emperor even further into a corner. Nevertheless, Naofumi decides to add fuel to the fire by capturing the country’s former capital! But he learns that someone is pulling the strings from behind the curtain.

“Whatever. Our only choice is to keep pushing forward. There’s no stopping now.”

Just before Naofumi’s party reaches the former capital, they come face to face with the emperor’s ultimate line of defense: Sadeena’s sister?! Faced with Q’ten Lo thrown into chaos by family feuds, what will Naofumi do?! Lead its people to revolution!? Join the battle in volume fourteen of this otherworldly revenge fantasy!