They're in England, that's an epilogue for school, supposed to be pastiche. Atomic bombs destroy everything at the end. But as the tittle says the end is not the end. Credits to a guy from drama class for the tittle.

Marco is 10th grade. His father becomes violent when his mother dies, seven years ago. All Marco wants is to escape this circle of pain and loneliness that he calls his life. He doesn't have any friends. Until, one day he is forced to sign up for a camp with the strangers that are his classmates, in order to escape from his father at least for a little bit. (Jean x Marco ship)