Strange Tales from the Underworld: the Legend of the Ghost King

The story unfolds with the heroine as the main line. She was born in the end of the world when gods and demons gathered, and she was childhood sweethearts with the male protagonist. She appeared in the new world in the second volume. She was the weakest among the gods in the first volume, and the strongest in the second volume. There is a male protagonist in the first volume. In the first half of the second volume, the male protagonist is injured and loses his memory and his whereabouts are unknown. He only appears in the second half (the memory related to the female protagonist was never recovered before she died). The first volume is the foreshadowing, and the second volume is the main text. The second volume describes the heroine's journey from amnesia to retrieval of memory, and then overcoming obstacles to find the male protagonist (the male protagonist is a very subtle existence) It mainly focuses on the female protagonist's experience, and there are not many emotional scenes with the male protagonist...