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Family
A member of the ruling Hīragi family of Japan, who are also in charge of the Japanese Imperial Demon Army, Shinoa is not a prominent member where her older relatives occupy the ruling ranks, but still receives benefits from her surname.

Due to what befell her sister Mahiru, she avoids army politics hence the scarce amount of interaction with a family preparing its members to be ruthless leaders if anything. Shinya, an adopted member is one of the few who Shinoa gets along well with, where she is prepared to work with Guren against them.

While generally Shinoa keeps her background to herself, it does affect her relationships with others. Although Shinoa can be held in high regard, there are also comments that she is spoilt.