Teisou Gyakuten Sekai no Doutei Henkyou Ryoushu Kishi

After reincarnating into a world where gender roles and moral values are reversed, and women hold dominion, Faust was nurtured by his mother to become a rare male knight. He swiftly rose to prominence as a war hero, amassing numerous accolades. However, due to the influence of his past life's mindset, he experiences intense discomfort daily. This is triggered by encounters with figures like the Queen, who dresses in a manner that leaves little to the imagination, or the Duchess, a bosomy friend known for her frequent sexual advances. The contrast between his upbringing and this new environment causes him significant distress.