Aya is a Kami-sama, a nature spirit, who has been waiting for "someone", an angel or divine being who gave her half of his soul to protect her after her parents prayed for their daughter's well-being.
Aya is a young girl between 15 and 16 years old, of short stature, purple hair and honey-colored eyes and brown skin, with a mark similar to Aru's, a circle with a red dot in the center at the height of the heart, with a scar running down the middle. Aya is a strong-willed person with a lot of enthusiasm, with a lot of power, but that also makes her afraid of disappointing Aru and being left alone again, she tries to follow Aru's plan to be a normal girl, but she's just not a normal girl, normal human being and rejects that behavior.