Collina is one of Alfred's test subjects who Aya meets early on in her quest to rescue her father.

Collina and her mother moved in to live with the Drevis family, her mother presumably hired as a servant. Eventually, Dr. Alfred had his assistant Maria fetch the young girl to test out some new medicine he made on her. Collina begged the two to let her go and take her back to her mother, to no avail. After getting injected with the medicine, Collina's life began to violently fade away as her skin turned light blue and her eyes went blank.