พันธสัญญาจิ้งจอกเก้าหาง

Reborn into the apocalypse, I rise as an SSS Feralmancer. My ex leaves me for an S-rank genius, so I form a contract with a D-rank fox everyone laughs at. Hidden from all, she’s an SSS Novem Empress. With a dual contract, she evolves three levels in three days. When the beast tide descends and the city betrays me, she has already reached eight tails!