Bright, clear, and calm. Mirror Lake. A huge and sophisticated dungeon system, a keyboard-like division of labor, a mysterious race in the corner of the partition, an annual festival related to the moon, a river with an unknown source, the Lost Land (endless wasteland, a burial place of countless dead bones, no vegetation), the Aquatic Tribe Museum (a beautiful dating destination, it also seems to be a sanctuary for marine life, but the gates open at 1:30 every day, drawing sea water to wash the blood in the warehouse), the "devils" who claim to be subspecies, and a series of strange things that are incomprehensible caused by them.