The Black Siblings are four orphaned, teenage siblings who go by the name of Bachika and claim to be Beastmen-hunters. The eldest is Kittan, followed by Kiyoh, Kinon and then Kiyal . In the first half of the series, all four siblings are clad in black outfits, hence their group's name. In the second half of the series, the three sisters wear normal clothes while Kittan, being a government official, wears his uniform.