I Bound the Goddess System on My Class-Change Day, and Now I'm Invincible

In 2133, Earth entered the "Age of Rule Reshaping." A higher-dimensional civilization cast down fragments of Systems and forcibly fused them with the human world. From then on, every adult reaching the age of 18 had to participate in the "Universal Class Change" System.

Classes, talents, skills, Systems... everything was decided by fate. And the world gradually fractured into secret dungeon realms, abyssal rifts, battlefields against other races... In the blink of an eye, the strong prevail and the weak perish!