All you really need is the basics yaknow? Day Class - Humans. Night Class - Vampires. They co-exist thanks to the disciplinary committee (Zero & Yuki) that keeps all vampire activity to a minimum. Zero is also a vampire, but keeps himself in check with blood tablets, something created by the Night Class for vampires to continue to drink blood without having to actually bite a victim. But he’s still uncontrollable, and threatens to fall to a level E, which is the worst state of being a vampire and all level E’s will be removed of. On top of that, he’s also a vampire hunter, hated by the society for what he is, but they let him continue on anyway. That enough info~?