Hangyaku Sha Toshite Okoku De Shokei Sareta Kakure Saikyo Kishi Yomigaetta Shin No Jitsuryoku Sha Ha Teikoku Route De Eiyu to Naru 1 (Overlap Bunko) [Light Novel]

[Machine Translation] Ardia, the kingdom's most powerful knight, was instrumental in ending the war between the Kingdom of Reschfeld and the Vulcan Empire. Ardia became a hero, but for some unknown reason, she was executed as a traitor. She is left with the regret of not being able to save Valtrune, the Imperial Princess, who had saved her from death despite being an enemy of her. However, when Ardia wakes up, she finds herself in a world six years before the war! Determined to save Valtrune's life, which she could not achieve in the past, Ardia swears loyalty to the Imperial Princess as a knight of the empire in her second life and changes the world! The most powerful knight who was executed returns to become the most powerful knight again in this retrograde reincarnation fantasy!

レシュフェルト王国とヴァルカン帝国の戦争終結の立役者である王国最強の騎士アルディア。英雄となったアルディアだったが、あらぬ理由から反逆者として処刑されてしまう。敵対しているにもかかわらず瀕死の自分を救ってくれた、帝国皇女ヴァルトルーネを救えなかった後悔を胸に―。だが、アルディアが目覚めると、そこは戦争が起こる6年前の世界だった!かつて果たせなかったヴァルトルーネの命を救うと決めたアルディアは、二度目の人生では帝国の騎士として皇女に忠誠を誓い、世界を変えていく!処刑された最強騎士が再び最強に返り咲く、逆行転生ファンタジー開戦!!