鶴 さつき

She acts as Kaoru's minder for the duration of the rite due to his age. She's also Kaoru's legal guardian together with her husband as his parents have passed on because of a car accident.

 Satsuki is blackmailed by Kaoru to join him during the rite as she is found out to be a prostitute of her own volition without her husband's knowledge. Satsuki despite this goes willingly with Kaoru in the hope that he will one day accept her as his foster mother. /