Category Manga: FOR ART STYLE (the style is in manga style, vertical format)
Serena, an ordinary human girl, managed to summon two demons after she took an interest in demonic powers. Being the first human in 1000 years, she piqued the curiosity of the two demons, who then chose to stay by her side. This event however sent waves of energy through the supernatural community, who took an interest. Most of which wish to take her for themselves for her summoning powers (or for just plain sexyness ;) ).