Fuyuko Sasaki

Fuyuko is an idol and actress employed by the same company as Ai. Meeting Ai as a child, Fuyuko is later tasked as the popular idol's babysitter for her two kids, Aquamarine and Ruby. Despite not being enthused about it, Fuyuko later dates Aqua after he enters highschool, but is soon targeted by his father, who has become obsessed with preserving Ai's legacy by killing anyone who tries to pass her