Zombie Apocalypse, Starting with the Contract Tyrant

Update 10,000 words per day, large volume and full management! [Zombie apocalypse + system + tyrant + upgrade to fight monsters + contract + grind dungeon + refer to Resident Evil/House of the Dead] Scarlet blood rain fell, and the dormitory building became a hell. In a desperate situation, Chen Zhou was bound to the [Doomsday King System] and was forced to contract a three-meter-tall tyrant zombie to start the game! While others are struggling to survive in the apocalypse, Chen Zhou has commanded the tyrant to blow down the canteen with one punch, crushing all dissenters. You get points by killing zombies, and the tyrant can evolve! From becoming the king of the campus, to forming a zombie army, until transforming into a tyrant, facing the mysterious floating island behind the apocalypse... This is a doomsday journey that uses absolute power to crush everything!