STORY OF THE TRIO :

They're sister and are oriniginally human but they have almost the same story than cyborg they are acctualy semi-robot.

THE ACCIDENT :

Is was a car accident Carla get the most hurted and she's actually the younger sister is she who was driving the car and kaira was not that lot hurtled but still was she was 4 yr when is happen she have actually 6 kaira decided to try to woke up Carla and it's work they emmiditatly got to the hospital Kuromi talked a long time to woke up. But is acctualy Kaira who saved thyer life she's did't even close here eyes during the accident. Carla have a thing that the other not have "a robot hand" is a proof that her got the most hurtled.