The Princess in Havoc!

He reincarnated as... the villainous princess's instructor from the grotesque, yandere-filled eroge he used to play obsessively in his past life!? When Alfred regains his memories, he realizes he's destined to be beheaded by the princess, and falls into despair! Determined to shout "I don't wanna die!" and change his fate, he uses every bit of game knowledge revived from his past life to begin a full-power survival strategy. But in reality, the princess is unexpectedly adorable...!? Betting his life, he aims to prevent the heroine from turning into an S-queen (...or push her that way?), in this fate-changing romantic comedy—now begins!

(Source: Akita Publishing, translated)