Top 6 in Top 25 best anime about vampires you will want to watch right away.
Black Blood Brothers vampire anime trailer
Black Blood Brothers, the best anime about vampires but in fact its vampire element is also basically just the context for the relationship between the characters. However, mechanically, their vampire identities are important because they are based on social norms, fictional histories, and even combat skills.
So keep peeling off Black Blood Brothers to enjoy it. By the way, there's also a strange character reveal at the end of the series waiting for you to discover that.