Return of the S-Rank Hunter: A LitRPG Apocalypse Adventure - Lanaeus

Once an S-Rank hunter, Kain is reborn at the start of the apocalypse… as an F-Rank. With the System’s arrival 100 years ago, Earth was transformed into a deadly progression realm. Countless wars were waged, millions of lives were lost, and chaos descended. By the time Kain was born, humanity had lost. The monsters had triumphed.