Time and Space Hunting

"Because I have a heart, I am a killer and not a killing machine." He was once one of the "Top 12" of the Nibelungen, the world's number one assassination organization, but was hunted down by the organization because he learned of a certain plan. At the same time, he is also the culprit that will bring about the near-extinction of mankind in the future. That day, the assassination of a girl from the future changed everything for him... From the present to the future, from the Nibelungs to the Pentacle; from the future to the present, from the Garden of Eden to the Day of Collapse. "AKUMA" plan, future technology, over-the-limit objects... No matter in the past or in the future, killing has never retreated from the curtain of history! Even if you can't change your already doomed fate, you still have to use these weak hands to change your ridiculous future! If there is any similarity, I would be honored. Plus, this is the original! It's half a light novel, right qwq This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.