I Have a Doomsday Summoning System

Fifty years ago, humans on Azure Star unexpectedly received greetings from the distant starry sky. Fifty years later, when humans were fully looking forward to communication with extraterrestrial civilizations, a meteor shower came. Nine meteorites as huge as stars fell on the sky blue star Kyushu. Since then, mankind has entered the zombie era, and everything has returned to silence! This is not the most terrifying thing. The most terrifying thing is the arrival of alien races decades later. Where will the human race go... Nan Ming, a scientific researcher fifty years later, accidentally brought the last human crystal back to fifty years ago, the first day of the sudden change in the world. Faced with this world that is about to collapse, where will he go?