Owari No Seraph Theme

Wondering what 'Owari No Seraph' means in English? It actually means Seraph of the End. Based on the title itself, you can already guess that this is one dark manga series. Of course, if you have always loved this series, you know that you need not guess about it anymore because you already know what it can offer you and what it needs. This may be related to creatures that people do not usually believe in but it does not mean that it is not interesting. In fact, you may find this interesting enough that you would like to place this as your computer's desktop wallpaper right now.