The Grudge System's Revenge

Apocalypse arrives. Lucy Shaw is locked on the balcony by her roommate Vivian Sutton and left for dead. She binds with the Grudge System, gaining power, skills, and supplies. She launches a counterattack, taking revenge and dismantling villains like Miles Zane, Yvonne Jordan, Professor Warren. When the cold ends, a zombie horde appears. Lucy uses her system's skills to establish a safe zone, defend the dormitory, traitors suffer. She transforms into the strongest heroine of the apocalypse.