Rust Blaster is a vampire story, but a little bit different from others. The story begins with a happy school scene, but everything goes very different from what you'd expected. That's the point of this manga. It's disappointing the manga is only about 6 chapters. But, the mangaka actually connected story very well. When you read the story, you'll laugh, you'll get angry, sometimes be excited, and be sad.
Be sure to read 6 chapters at once.