Oshi no Ichizu Sugiru Shuuchaku o, Watashi wa Mada Shiranai

Seha is devoted to Alexandrite, her favorite character in a dating sim, and is devastated to learn that he dies in routes other than his own. She wakes up inside the game as Lady Arianell, a minor side character, and sets out to save him. To protect Alexandrite, Seha plans to act as a villain and steer him toward the heroine. But he falls for Seha instead, while his flirtatious brother also takes an interest in her. As the story departs from its intended course, Seha must try to save her favorite without becoming the cause of his downfall.