- Name: Chou Senka
- Age: Unknown/Appears to be around 20
- Gender: Male
- Birthday/hometown: 08/22 / Somewhere in Hell
- Short info: Senka is a demon that can only change forms in special situations and like vampires, hunger for blood. That kind of demon can blend extremely well in the human society because they can hide their features, but when exposed to very high temperatures or extreme heat they get weak as if they were sick. They are called "Class F" demon by the humans.
Senka is a fairly pacific being who had always been curious about the human world, what lead him to run from hell and find somewhere to live along humans. The first person he became friends with was a little girl that lived next door. Even in his human-looking form she could see that he was "a being from another world", a demon, but she wasn't scared. She teaches him some chinese on the roof of the building they live at twilight from time to time.