Would it be right to call it a reunion? After all, the two girls used to be one. Light and shadow, torn by the same desire, only to meet again at this most unlikely place. Their conflict violent and desperate, the two halves risked everything to be whole. Exhausted, the two were drawn into Yggdrasil, the World Tree...
At the same time in another place, a strange space vessel appeared from an interdimensional gap.