Earth is invaded by monsters, but the military is able to fight them back... until cosmic creatures able to destroy whole cities in a matter of seconds invade the planet. Most of the world was destroyed alongside with the majority of the population, but humans obtained the power to fight back when shrines appeared all over the world, and humans who entered those managed to obtain the power of the heroes of the legends. King Arthur, Heracles, Achiless, Miyamoto Musashi, Li Xin... humans become super humans and begin to fight back, but they don't know that the second wave is coming. Six months after the end of the world, Stahn wastes away his life while playing games in an abandoned apartment for six months after losing everything, his family, his friends, and his girlfriend. However, much to his surprise, Stahn was chosen by a group of suspicious heroic spirits and obtained the power to obtain the systems of the games he beat.