1000年王国/ 1000-nen Oukoku

1000-nen Oukoku is a visual novel from Log where you play as Shou as he is tasked with saving humanity from the end of the world in 1999.

The prophet Nostradamus has foreseen that the world as we know it shall end in the year 1999, and the thousand-year kingdom of angels and children will commence. A young boy named Shou is at first unaware of these prophecies, enjoying a normal life with his sweetheart Alisa. However, a series of events changes his life forever, as he is entrusted with the task of saving humans by discovering the ancient continent of Atlantis.