The elves fell in the Doomsday War thousands of years ago. When all the people were killed in the battle, only the elf princess escaped into Fantasyland. She used the core of the Great Holy Tree she carried to create a new elven race - Noah.
Thousands of years later, during the ritual of summoning a familiar, the princess of the old continent accidentally summoned the young guardian of Gensokyo. As a result, the two clans that had parted ways for nearly a thousand years became entangled again, and what will be the fate of this guardian who had two masters from the beginning of his birth...