九十九 朔夜 ≪Blaze Diabolica≫
from Absolute Duo
Origin
Japan
Sakuya Tsukumo is the chairman of Kouryou Academy, and the genetic engineer from that institution who takes part in their research. She is also known as ≪Blaze Diabolica≫ because of her grandfather's name, ≪Blaze Innovator≫. She also inherits her grandfather's research about the ≪Lucifer≫.Sakuya is shown to wear a Gothic style dress, with black hair curled at the bottom part and an appearance that seems to be a 10-year-old girl. She also has dark violet eyes and pale-white skin, and appears to be rather light in weight. Her dress is covered in black clothing style with white frills at some parts She also wears a head dress that almost covers her head, with pink rose at both sides of it.Based on Tooru Kokonoe's first impression, she poses such "Devilish, or ominous" aura while watching her in the first volume. He also sees Sakuya as heartless, as she forced the weaker students off the island. However, Tooru didn't reconsider when Sakuya bowed and apologized about not informing about the students on the alternate island. But Sakuya didn't deny the fact that she is heartless to throw others away if necessary for her own research, and treating like them as experiments. She seems to be quite calm, but sadistic at the same time. But as her age she can't hide her dissatisfaction, especially when Lilith Bristol whispered to Tooru (that reached the chairman's ear) that she was truly shy and lied about herself. (That proves to be a little lie of Lilith to make Tooru think that Sakuya was nicer than she appeared.)

Absolute Duo
Individuals who can materialize weapons from their soul are called "Blazers," and they attend Kouryou Academy High School in order to harness their abilities. Each student is required to partner with another, in the hopes that one day, the pair can attain the power of Absolute Duo. Tooru Kokonoe hopes to attend this academy in order to gain power after his sister and friends were slain by a mysterious man. However, at the opening ceremony, he is forced to duel against the person sitting next to him, with the loser being expelled. As Tooru prepares to give the match his all, it is not a weapon that manifests from his soul, but a shield, an irregularity which catches the attention of a foreign student named Julie Sigtuna.