The Elf Kingdom has encountered an unprecedented disaster. The Elf people are facing a major crisis due to the lack of wood energy due to excessive human damage to the environment and the death of the sacred tree. (The energy of wood is an important spiritual energy used by elves for survival.) The two princes of the Elf Kingdom volunteered to search for the source of wood. The Elf King ordered the three elders of the Elf clan to open a passage to the outside world, and thus the two Elf princes began their different destinies.