When the world planes were threatened by an unknown threat that can eradicate everyone's existence, the humankind of the original world was called upon to take the mantle to help save the world planes. Aira Giyera was one of them. She was someone who had grown to not care too much about others that wouldn't benefit her and her family despite her secretly yearning to also experience a life of normality where she too can be friends with others without motive. For her, this Trial was a new chance for her to get out of this mindset and live a life where she and others will have a common experience. But, after clearing the Abyss of Hell, the trial where Aira was forced to kill every single Grimm, she opened her eyes to a world, far different from what she expected to return to, filled with Grimms, powerful humans, other intelligent species, and dangerous criminals. It was a world where everyone already succeeds in bringing back civilization. A world that already has a force to battle against those that wished to bring the civilization to ruins. Aira felt lost. She wanted to return home, reunite with her family, and be ready to cooperate with others and fulfill herself to make friends but what could she do when hundreds of years had already passed? And Progenitors, the so-called first humans of this world had long died out. And she is the last. . This story is inspired by many novels and some TV. series. I am a reader of many kinds of fiction except modern love stories and crime stories and I have been wanting to write my own Original Novel for years. This is a story I have been outlining with combined ideas of other trends and my own. While this has been rewritten many times due to my wishful perfection and planning, I decided to just go for it despite my senior year school activities and blah blah blah stuff and see how this would go as time went by. Expect Monster fighting, a different system leveling, flawed character that should have development, obsessed characters, transmigration character, school life filled with heroes and villains of this world, cults, historic gods, and yeah. I got many ideas to put into this.