When the world goes to hell

Shoyo' was twelve when the world ended he was in school when he got a notification from his phone from the news saying a virus spreaded out and it started from japan and worked it's way to America,as his journey went on he met Rick who just got out of the hospital from being shot,how will their journey go as the two meet and trying to find his my and his little sister and Rick trying to find his wife and son and Shoyo is also trying to find his childhood friend Kageyama