1boy, 1girl, black_legwear, blood, blood_sword, blush, cover, cover_page, demon_girl, demon_tail, demon_wings, green_eyes, hand_on_hip, horns, index_finger_raised, long_hair, looking_at_viewer, novel_cover, pointy_ears, red_hair, skirt, smile, sword, tail, thighhighs, twintails, weapon, wings, zettai_ryouiki