Survivors of the Apocalypse

Every time we mention the earth, we must remember it's going to end. When Nino wakes up in a cave just after a nuclear war along with classmates he barely knows, he sets out to try to find a new life in a broken world, but in addition to the strange weather phenomena and rough terrain, there is a group of masked people targeting him, and as soon as they get word of other survivors Nino may know, hope rises for Nino.