The Eleventh Day of the End of the World

My name is Mo Xiao, an ordinary senior high school student. An unimaginable disaster has occurred on my planet. After the dark night that may strike at any time, there is a despairing sunrise. Endless monsters began to slaughter wantonly, but I gradually discovered that there seemed to be a huge conspiracy behind all these disasters. And then... I was chosen to save the world? I'm obviously a student!