Eroge Tensei: Unmei ni Aragau Kin Buta Kizoku no Funtouki

A man wakes up to find himself reincarnated into the early stages of a popular eroge game he had recently completed. He discovers he is now playing as a character who, in the game, opposes the hero and is inevitably defeated. All possible story paths for this character end in death, and in this new reality, he has already lost a duel. With no way to avoid his fate, he uses his prior knowledge of the game to try and change the outcome. His goal is to survive and alter his doomed storyline.