What story is the Norse goddess telling?

The game background of the legend of Nordic Goddess is Nordic mythology. In order to cope with the twilight of the gods, Odin, the main god in Norse mythology, sent Valkyrie to Valkyria to find the strongest warrior among human beings, and collected their souls to the gods to deal with the giants in the twilight of the gods. So the story began. This is a game with near perfect score on PS, superb 2D picture and novel combat system, which are the reasons why this game was popular at that time.