im trying to find a manga but dont remember the name ,just the cover. the first volume has a cover of a girl in a black and red japanese school uniform piercing her own chest with a large katana. . the manga is an older one, with more a creepy\terror focus than romantic. the background has just black colors and the colors of the cover are only black and red. i think the name is "la princesa\doncella sangrienta" or demoniaca\infernal in spanish, I saw it in a bookstore a while ago and can't find it anywhere online.