Humanity dove into a conflict against mythical serpents, who have attacked the earth! Simultaneously, among the people emerged individuals with heavenly powers, called psykers. Through the innumerable penances of psykers, the conflict appeared to be reaching a conclusion with mankind as the victors. In any case, when a psyker with the capacity to see what was to come predicted that the winged serpents will be returning in 15 years, individuals laid out Ark, an office to prepare kids brought into the world with mystic capacities to get ready for the last conflict of mankind. There are just three years staying until the prophesized war. What will occur straightaway?! "Endure regardless." Humankind was ill-fated for destruction by the 'Mythical serpent'. To safeguard the world near the very edge of Judgment day, the conflict vagrant Lee Han stirs as a 'Psyker'!