サファイア
from The Testament of Sister New Devil
Sapphire is the younger sister of the previous Demon Lord, Wilbert thus making her the aunt of Mio and Maria Naruse, as well as the biological mother of Basara Toujou. Sapphire is a beautiful buxom young woman with red hair and red matching eyes, as well as bearing a resemblance to both her older brother and niece. During the Great War, she is shown to be dressed in a dress that showed a lot of her legs and breasts with a collar, as well as armored gauntlets. After Basara had been exiled from the Hero Clan, she took form as a human woman and visited him in secret. Though not much about her has been revealed, Sapphire is shown to be both compassionate and courageous as she sent back her allies to fight against Jin during the Great War so that no one would get caught up in their battle. In their several battles, she may have developed a hint of a rivalry with Jin since she hated the fact that Raphaeline intervened in their battle despite mentioning that the Great War ended. She is also shown to be cooperative as she assisted Raphaeline, who was meant to be the demon's greatest enemies to rescue Jin from the dimension they were trapped in. Sapphire soon grew to care deeply about Jin and Raphaeline to the point where the three decided to have a child that was their's, however, after Raphaeline couldn't return from the Divine Realm she was unable to enjoy a life with Jin and Basara without her. Though having heard about the incident in the Hero Clan, Sapphire met Basara and consoled him about the incident before erasing his memories of him meeting her. She cares enough for Raphaeline is further shown as she went into the Divine Realm in order to save her from even the Ten Gods who imprisoned her.
The Testament of Sister New Devil
Running into your new stepsister in the bathroom is not the best way to make a good first impression, which Basara Toujou learns the hard way. When his father suddenly brings home two beautiful girls and introduces them as his new siblings, he has no choice but to accept into his family the Naruse sisters: busty redhead Mio and petite silver-haired Maria. But when these seemingly normal girls reveal themselves as demons—Mio the former Demon Lord's only daughter and Maria her trusted succubus servant—Basara is forced to reveal himself as a former member of a clan of "Heroes," sworn enemies of the demons. However, having begun to care for his new sisters, Basara instead decides to protect them with his powers and forms a master-servant contract with Mio to keep watch over her. With the Heroes observing his every move and the constant threat of hostile demons, Basara has to do the impossible to protect his new family members. Moreover, the protector himself is hiding his own dark secret that still haunts him to this day...
