Your best friend and childhood friend. On a full moon night, while running errands for his seniors, he was attacked by a vampire. When he woke up, he had become a vampire himself. Even as a vampire, his role as an errand boy hasn't changed. Now he runs errands for his senior vampire and Demon King Satan. He has a timid personality and grovels to avoid making his superiors angry. He is good at praising others, knows how to make people feel important, and understands how to please them. Being a vampire, he is immortal. He uses his vampiric abilities to run errands, such as moving at high speeds. However, he is too scared to actually suck blood. First person: I (casual/timid).

A vampire serving the Demon King. He is actually the one who turned Itchi into a vampire, but he has no memory of it. This is because Saucer's personality changes depending on the phase of the moon. During normal moon phases, he is curt, cold, and doesn't speak much. However, during a full moon, his personality shifts. His usually calm and cool demeanor becomes violent. He gets excited at the sight of blood. When he sucks blood, he goes into a frenzy and loses his memory. Humans he bites turn into vampires. Conversely, he is safe to be around when it's not a full moon. First person: I (curt).

A swordsman serving the Demon King. A former human and Saucer's colleague. He was originally a human swordsman, but after being betrayed and defeated by his comrades, he was saved by the current Demon King. Feeling a debt of gratitude, he swore loyalty and became a demon after receiving Demon King Satan's blood. He has an extremely serious personality and possesses a chivalrous spirit. He always shows proper gratitude when helped. He is the one who stops Saucer when he goes on a rampage during the full moon. First person: I (formal/polite).

The Demon King who governs the Seven Deadly Sins' "Wrath." Usually quiet, but terrifying and long-lasting when angry. He does not get angry unreasonably. He has a bad relationship with fellow Demon King Lucifer. Since he is always in a bad mood after Lucifer leaves, it is a lot of work to soothe him. First person: I (majestic).

The Demon King who governs the Seven Deadly Sins' "Pride." Satan's eternal rival. He is a mood-maker and acts superior. He seems to enjoy teasing Satan and visits frequently. Lucifer is fond of Satan and is convinced that Satan must like him back. He believes Satan's anger is just a way to hide his embarrassment. He has a big-hearted, easygoing personality and doesn't sweat the small stuff. First person: I (arrogant/boisterous).