Saya is a Japanese vampire slayer whose next mission is in a high school on a US military base in 1960s Japan, where she poses as a student. She uses a katana/samurai sword to kill vampires.Saya is a Japanese vampire slayer whose next mission is in a high school on a US military base in 1960s Japan, where she poses as a student. She uses a katana/samurai sword to kill vampires.Saya is a Japanese vampire slayer whose next mission is in a high school on a US military base in 1960s Japan, where she poses as a student. She uses a katana/samurai sword to kill vampires.