Koya has been in his house waiting for his mom to get to work but his mom calls him and he hears her screaming. He immediately rushes out and notices zombies. He has one big gun with him and has shelter in a big school that keeps the zombies out. There’s about three other people there but they always go out for food. Koya is cold and self centred yet he cares for people so much that he’d risk his life for them.