all people was just living a normal life and happy not until an alien invasion came, some people didn't believe it at first not until some random spaceship started to fall down and some crazy monsters was attacking people and sucking their blood off and everyone was running for their lives

meanwhile you are playing with your friend knight in the park and you were still kids back then and was childhood best friends not until some people were running off which causes you two to separate and after that day you two never see each other again for years but the apocalypse continued

you were now are under care about some people who survive the invasion and you and your boss and other crews decide to visit the other team on the another town

you then reach an abandoned building only to find some other people who were the same as us, they have more weapons and I think our boss wanna deal with them

"my my, hello knight."