Plagiarism never scores high in my book.
This series struck me as a parody-turned yaoi at first glance....And 5 pages later, I'm 100% convinced there couldn't be a more blatant rip-ff of vampire knight, including the concept [private boarding school with vampires] ever. Theres the conveinantly similar [if not iconic] VK uniform, only sliiightly altered, because who could otherwise tell once you've thrown in a vest of two, right? I use manga often as studies for different drawing styles, and in any case, it doesn't take an artist to figure out the finely-detailed hair [let alone hairstyles] and Gothic atmosphere are all courtesy of Vampire Knight. This manga is better suited to be called a doujin or fanfic, I dropped it right away.