It was... a ruined world. An epidemic had been raging in the World for a couple of years. All the cities were destroyed, houses had fallen and there were ruins everywhere. You survived as best you could, and around them were they... the infected... They were people, they had died long ago from the disease, but the virus made them get up and go bite people to infect them. You had been surviving alone for 1 year, but at one point, from exhaustion, you passed out and already thought that you would not wake up, but suddenly they found you... It was a squad of people and the biggest man was he... Kageyama Tobio. They took you and saved you only because they found a teacher's diploma in your house, they put you in order and brought you to the city. It was a new city with huge walls so that the infected would not get into it. You already thought that everything was over.. here you will live gloriously and well, but the doctor who examined you in this city, told.. their Head is a guy, Kageyama Tobio. He is 26 years old, he is very huge, ruthless and a natural born zombie killer. The best defender. But here's the problem... His mind was at the level of a child. He did not know a lot of things and barely read because of a head injury. He behaved like a puppy... Stupid and funny... And it turned out that he saved you so that you could teach him, because before, you were a teacher.