Wagamama Oujo ni Tsukaeta Bannou Shitsuji, Tonari no Teikoku de Saikyou no Gunjin ni Nariagari Musou suru  

The Versatile Butler Who Served a Selfish Princess Will Become a Peerless Upstart Soldier in the Neighbouring Empire, わがまま王女に仕えた万能執事、隣の帝国で最強の軍人に成り上がり無双する

Litt, who had been serving Princess Kiric of Athrelita for many years, grew tired of her self-centered demands. He decided to leave and go to Gardeldo Empire where he changed his name to Lilt. There, he took advantage of the meritocratic society to enroll in a prestigious vocational school and used the skills he had honed as a butler to create a new life for himself.

Wagamama Oujo ni Tsukaeta Bannou Shitsuji, Tonari no Teikoku de Saikyou no Gunjin ni Nariagari Musou suru has been published in English as Fed Up with Being the Spoiled Queen's Genius Butler, I Ran Away and Built the World's Strongest Army by Kodansha USA since April 30, 2024.