Synopsis

Emie Mercer was one of several billion people who survived the apocalypse and was introduced to a new reality where magic was commonplace and everyone had access to a system. Unfortunately, the rest of Emie’s family wasn't so lucky.
As far as world-changing events went, Earth’s reintegration into the Atlantis Alliance was remarkably tame. The post-apocalyptic universe mirrored the wildly popular, deep-immersion VRMMORPG – Atlas Online, allowing those who played to quickly adapt to their new reality.
More than a decade later, Emie manages to create a formation that relies on her Time and Space affinities to return her consciousness to the past. When she arrives nearly four years earlier than expected, Emie realizes she has a unique opportunity to prepare and train for what is coming.
Book 1 is now available on Kindle Unlimited!
Book 2: Having gained access to the system and magic early, Emie has been granted a better opportunity to prepare for the apocalypse to come. Working with Alliance personnel, Emie tries to leverage her knowledge of the future into functional assistance without drawing too much attention to herself. With the support of her boss and mentors, Emie continues to grow and learn, expanding the gap between herself and the rest of the natives of Earth.
NOTE: The MC does not know everything, she makes mistakes and becomes short-sighted occasionally... If you are looking for a returner story where the MC is super over-powered, remembers every cheat, and knows every important event that will happen... this one probably won't satisfy you.
Please note the content warnings, though they are pretty minor aspects of the story and don't come up very often.