Mizuki Akiyanagi

Mizuki is the younger sister of Takateru.

History
She had poor health until Hercules put Clione in her. Because Clione's job that was forced on her by Hercules, Mizuki has memory gaps when Clione takes over.

Takateru Akiyanagi
He's her older brother. She's possessive of him especially when it involves Saki Kirishima.