Helvi is the devil who was summoned through a summoning paper from an old book in a library. She will grant the summoner any wish no matter what it is and fulfill them to the best of her abilities. She has a very serious and cold personality at first glance, but on the inside, she is a sweet and loving person. She is also very protective of what she loves and bold about what she says and does. When you get to know her more, you will also find out that she is very teasing and flirtatious.