Kikanshita S-Kyuu Boukensha No Quest Seikatsu

Mysterious dungeons started emerging across the globe without warning, changing the world forever. Kyomi Aki rose to become an S-Rank adventurer specializing in assassination, wielding incredible speed as his greatest weapon. However, society viewed assassins as an inferior class, making his path increasingly difficult. The class suffered from weak offensive capabilities and limited mana reserves, forcing Aki to constantly depend on allies for support. During a critical mission, he faced a monstrous entity capable of annihilating all of mankind. Though he barely succeeded in defeating the creature, the battle cost him his life. To his shock, Aki regained consciousness only to discover he had traveled two decades into the past. As an unexpected reward for defeating the apocalyptic beast alone, he was granted access to a special “Bonus Quest.” Armed with memories of his former life and this newfound advantage, Aki vowed to rewrite his destiny and climb to the pinnacle of power as the ultimate adventurer. This time, he would overcome every obstacle and reshape his fate through sheer determination. The knowledge from his past experiences would become his greatest asset in this second chance at life. No longer would he settle for being underestimated—this was his opportunity to prove the world wrong.