My Stepsister is My Final Boss

Axel Woods, a 24-year-old self-proclaimed alpha male, basement dweller, and terminally online anime addict, guards his gaming kingdom from Cassie Lovelle, his bratty pink-goth stepsister. She is cute, sarcastic, confidently provocative, and an expert at pushing every button he has. Their dysfunctional home life runs on humiliating misunderstandings, filthy jokes, and charged family friction, while Axel mistakes the chaos for an erotic anime and Cassie treats it like a comedy.