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Even if little time has passed since Kireina's last move, the entire world was changing at a fast pace. Although inside her divine realm time went even faster so she could leisurely spend her time preparing and building up power for the future challenges, the world itself also prepared all sorts of challenges, and even Fate itself, refusing to be destroyed, set up all sorts of events for Kireina's future.
However, due to their timing, a certain faction of Invaders had acquired a great advantage even compared to their foes who had arrived here before, the demons of the gates of hell, and these beings were the Netherworld Plane inhabitant! The various Necrotic Death Lords that had begun to emerge into Genesis and moved into the Realm of Helheim, where their new recruit had been preparing herself for her future conquest of Genesis with the help of her new allies.
Check "The Protagonist's Sister Is Actually the Strongest"!