Not a Monster, but a Magical Girl!

Shihua transmigrated! She arrived in a chaotic world of magical girls and monsters, gods and demons, where the entire country had been torn apart and various factions were locked in battle. Just as she was searching for urban legends circulating online, trying every way she could to gain magical powers and earnestly hoping to become a dazzling, carefree magical girl herself, she suddenly discovered that she was already in the late stages of monster transformation. Before long, she would become a monster and be hunted by magical girls! Fortunately, she still had the System, which could enhance the abilities she possessed. So she would enhance her monster disease and the monster skill 【Devourer of Time】, and become the strongest monster of all! Before enhancement: Devour future lifespan to accelerate time and double one's speed. After enhancement: Devour future lifespan to reverse time and return to the state before transformation! “Wait, so I guess I'm not a monster anymore?” Shihua reversed time and became human again, but still retained her upgraded supernatural skills. Then... “That's right. I was never a monster.” “I'm a magical girl!” 【Dark magical girl, magical girls turned into idols and commercialized, alternate-history American Civil War setting.】