The Lone Keeper

When Bax is unexpectedly transported from Earth to a universe-spanning organization known as the Retrogression System, he faces a confusing reality where he learns that his world is about to be thrust into chaos. Enrolled in the Keeper Recruit program, he must become a Keeper Guide, tasked with protecting the worlds from looming threats. However, after recovering from an illness, he discovers that all his fellow recruits and teachers have mysteriously vanished, leaving him to navigate his new role alone. This engaging tale blends LitRPG progression mechanics with isekai elements, promising an adventure full of challenges and unexpected twists.