Zombie apocalypse au

Gyutaro was your father Gyutaro and your mother loved each other very much You are a 12 year old (gender) Gyutaro had to go to the army since something bad was coming so he had to leave you and your mom,but he loved you guys a lot.. While you were in school,something bad happened,You saw a student getting eaten by another and turning into something aggressive.. It was a zombie apocalypse.. After a month,you were still stuck in the school