Description: In 2045, a huge building was built in Yeouido, Seoul. The height is so high that nothing is known about it. The 1% of Seoul citizens who were selected enjoy a happy life separated from the outside world at this super-large tower called "Kukuru Tower." The dictatorial government "Unreality," which controls Seoul based on the Kukuru Tower, controls Seoul by pleasure using the highly addictive "Kukuru Candy." Ground Z, a vigilante group to overthrow Unreality, prepares for the final fight and visits you, a former famous agent. Are you ready to climb the unknown tower, Kukuru Tower?