Shy returns to school only to find herself faced with Iko Koishikawa, a girl whose injuries she blames herself for. As if that wasn't stressful enough, a mysterious young boy sows discord and forces the girls to face the darkness in their hearts.
Teru, that black crystal 
is her heart materialized.
.تيرو، تلك البلورة هي تجسد قلبها
Teru, diese schwarzen Kristalle
Teru, esos cristales oscuros
Teru, esos cristales oscuros
Teru ! Ce cristal noir,
Teru, quel cristallo nero
Teru, aquele cristal escuro é
a materialização do coração dela.
Тэру, этот чёрный кристалл —
воплощение её чувств.
เทรุ ผลึกสีดำพวกนี้...