I watched this shit as a kid and loved it. Now I'm an adult (and feminist) and I realize just how bad this was. I rewatched all of it in order to write an essay about the sexualization of vampires, and, if you want to read just how bad the characters are, here is an excerpt of their introduction:
"The oldest of these brothers, Shū, treats Yui like she is nothing to him as food. He refuses to call her by her name, treats her like nothing, and dehumanizes her. The second eldest brother, Reiji, has famously given Yui a cup off drugged tea and verbally and physically abused her when she dropped her teacup after passing out. The next in the line of brother, Laito, is a sexual abuser who believes love only comes in the form of lust; it is heavily implied he raped Yui. Kanato is the next brother; he is mentally unstable and manipulative. Kanato has admitted that Yui would be prettier dead and in one scene nearly succeeded in strangling the life out of Yui. Ayato, the brother after Kanato, is a misogynist; he treats Yui like a slave by ordering her to cook for him and throws Yui into a pool when she tries to refuse, despite the fact that she can not swim. Subaro is the youngest brother, and the nicest. Subaro will yell and break furniture when he is mad, often terrifying Yui into submission; but he has been the only on to treat her like a human and once tried to help Yui escape the six brothers."