Integrated into the Multiverse: Carl and Alma

Thirteen-year-old Carl Anderson, part of the illustrious Anderson family known for its achievements in business, science, and academia, faces scorn for his passion for martial arts, seen as inferior by his intellectually driven relatives. For twenty years, mysterious disappearances have plagued Earth, targeting those aged 16 to 45 and resulting in the loss of two billion people. Despite this global crisis, Carl's privileged life remains largely unaffected, thanks to his family's well-stocked survival shelter.

Three months before Integration Day, another billion people vanish. On Integration Day, Earth merges with three other worlds—home to the Vorath, Ursox, and elves—bringing back the disappeared as powerful levelers or cultivators. Everyone over 16 receives a system to manage their abilities, except those who had vanished.

Carl, navigating a transformed hybrid city blending New York with towering forests, relies on his martial arts skills and survival instincts to endure the new reality. On his sixteenth birthday, facing a dire situation, Carl interacts with the system, accidentally selecting "Hell Mode"tutorial tower and becoming a cultivator. This decision fuses his spirit with an AI entity named Alma, who becomes his crucial guide and ally.

Hell Mode pushes Carl to superhuman levels in martial arts, with Alma's guidance enabling strategic decisions and understanding of the new systems.

Ultimately, Carl embarks on a journey to reach the apex. What will Carl and Alma's story entail?