Naita Tori no Yuku Saki wa

A man who failed to achieve success in his previous life is reborn in a new world called Ryguil, retaining his memories. In this world, magic, skills, and levels exist, and he is given a special ability that allows him to learn any skill with effort. He sets out to become the strongest, but the world is filled with powerful monsters that cannot be defeated by magic or combat alone. Humanity is in decline as these creatures grow more aggressive. As he struggles toward his goal, facing setbacks along the way, his ultimate fate remains uncertain.