As for the plot of the ending of A, Valkyria Rinas unlocked the seal, found the memory of past lives, knew who her boyfriend was in past lives and how he died, and finally defeated Loki who killed Odin, became the creator and saved the whole world.

Let me talk about the other two endings.

The result is that Valkyria led the spirit of war to defeat the Warner protoss and unified the gods. Of course, Valkyria didn't completely recover his memory, but he just faithfully carried out his task, which was an ordinary ending.

The end result of C is that Valkyria completely ignores Odin and never uploads her soul to heaven again. After that, Odin was furious and ordered the goddess Frey to defeat Rainas.

Above.