Rebirth, Take My Sister to Become the Strongest in the World

On January 1, 2021, an extraterrestrial meteorite broke the peace of the world. Animals mutated overnight, human living space was reduced by 90% in just one month, and the world was paralyzed. My best friend in my previous life betrayed me. Unexpectedly, by chance, I was reborn a month before the disaster. In this life, I must become the strongest in the world. Obtain the system, complete the mission, and become the strongest in the world with your sister. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.