Sumika Kagami
Hakuryou Dai Fuzoku Hiiragi Gakuen, 3rd year, Class B
She is a bright, energetic girl who has feelings for her childhood friend and classmate, Shirogane Takeru, but they are not aware of each other's feelings until later.
One day, the world they live in is suddenly invaded by a horde called the BETA that appears from a parallel world.
Sumika was captured by the BETA and is about to be subjected to terrible things in the "Hive," the BETA's lair...