Rikka, Chiyo, Sekine and Tsubasa seem like regular middle-school girls, but they all have their own secrets.
and a GPS tracker 
embedded in our bones.
.وجهاز تتبّع في عظامنا
e un segnalatore GPS inserito nelle ossa.
e um rastreador GPS nos ossos.
личный номер на руке и жучок.