Behemoth Descended from Heaven

A planet outside the sky hit the galaxy next to the solar system for unknown reasons, causing a series of disasters. The male protagonist was reborn and returned to the past, returning to Earth. The earth at this time has not been destroyed yet, for the sake of the one I love. He is also thinking about how to change all this for the sake of human survival. But he didn't know that he was already at the center of the disaster. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.