The day our world ended

This is my first story, that I ever wrote. it might not be that long but I hope u read it till then end and also tell me if there is any room for improvement. Thank you This is a story about two brothers from India, in the middle of an apocalypse. That brought the death of their sister,leading them to fall apart. Karen and saifu, two different sides of a coin that walk through the hurdles in hell. Karan a guy who was preparing for his college after completing his school Saifu an athlete and good studying top tier guy in his last year of High school. Let's see how both of them survive in this new world with old people