Natsuno Yuuki is a fictional character from the anime series Shiki, which is based on a horror novel by Fuyumi Ono. He is a high school student living in the small, rural town of Sotoba, where mysterious deaths begin to occur. Natsuno is initially skeptical about the supernatural events happening around him, but he becomes increasingly involved as the story unfolds. As the series progresses, Natsuno's character evolves from a disbeliever to a key figure in the fight against the Shiki, a group of vampires responsible for the deaths. His determination and bravery make him a central character in the struggle to protect his community from the growing threat.