After the El Nos incident, humans were eroded by evil spirits and became violent, selfish, and terrifying. The two elves who caused this change were punished to reincarnate among humans for life after life, and it was their mission to eliminate the darkness. When love and responsibility came to them, they could only wander between pain and happiness until the end of their lives and were reborn with new lives. They were bound for life after life, wandering in the darkness forever.