Ruuna

The older sister of the demon siblings. She has a slightly goofy "kogal" tone of voice.

In addition to having sex in order to supply her energy, she loves to have sex and is extremely lewd. There is no sense of innocence or maliciousness about her. She is bright and cheerful like an American porn star.

She was once summoned by Tarou who took her virginity, humiliating her in the process. She is obedient to Tarou because she knows what he is capable of, and desires to have him lose his mind someday.

When it comes to her younger brother Riine she is the exact opposite of him. She is selfish, arrogant, lecherous and has a sport attitude.

She also views Riine as a "servant" and a "toy", the siblings often indulge with each other.