| Senoo Kasumi妹尾 霞空 |
| Aliases | 妹尾・L・霞空, Senoo Lightning Kasumi |
| Hair | Ahoge, Blond, Prehensile Hair, Straight, Twin Tails, V Bangs, Waist Length+ |
| Eyes | Violet |
| Body | Pale, Slim, Teen |
| Clothes | Blouse, Bracelet, Clothing with Ribbons, Detached Sleeves, Miniskirt, Pleated Skirt, School Uniform, Shirt, Suspenders, Thigh-high Stockings, Unusual Hair Ornaments |
| Personality | Atashi, Brother Complex, Energetic, Strange |
| Role | High School Student, Psychic, Roommate, Younger Sister |
| Engages in | Dimensional Travel, Flirting, Shopping |
| Visual novels | Main character - Imouto Spiral |
| Voiced by | Kurumi Botan |