The Empress's Evolving Mosquito

Chase dies, his soul transmigrates into a mosquito. He binds to the Infinite Evolution System, evolving and extending his life by sucking blood. He targets campus belle Luna Grace. One bite triggers an ancient Blood Pact, making him her Contract Beast. Reborn Empress Luna Grace intended to pact with a top-tier Spirit Beast, but a mosquito intercepted. Chase evolves infinitely to a Mosquito Emperor; Luna Grace, with the weakest Contract Beast, makes a comeback to her peak.