After I Ended Our Contract, My War God Ex Begged Me to Take Him BackEpisode 4

Isabelle, a gentle rabbit Beastkin, is bonded to War God Adrian Frost, who despises her and refuses to ease her Heat. After humiliation, she leaves him for injured former War God Caleb Voss. His tenderness heals her heart; her hidden power heals his psychic energy. As Adrian regrets, a conspiracy involving the Research Institute, the Swarm, and the Zero serum emerges, forcing Isabelle to risk all.