Kuroageha, born as Princess Naa, her house fell due to an enemy siege and she was murdered in cold blood. Prior to the siege, she found a mysterious insect like being (Resembling a giant caterpillar) who would later be known as the Eternal Insect. When she found the Eternal Insect it seems to be injured. Her parents ask her to get rid of it but she refused.
When Princess Naa was killed, the Eternal Insect resurrected her by granting her with some of his power.
Apperance
Princess Naa (Before her death)

Princess Naa has a petite figure with long black hair which is adorned with two purple orb hair piece. She has gentle face with green eyes. Her skin tone is fair flesh.
She wears an outfit befitting her lineage during the Sengoku Period of Japan.
Kuroageha (The Bug Magistrate)

Kuroageha retains her her original petite figure with some noticeable difference:
Hair – Her long black hair turns silvery white with the bangs slightly up.
Eyes – She retains her green eyes but its former gentle expression in now gone. Now it is void of life and shows signs of resignation.
Skin Tone – Her pale flesh skin Tone turns to an albino white.
Clothes – She still wears a noble woman’s outfit, but this time, the color is white with light blue line design. She also wears a headgear adorned with two dangling bells.
Insect-Human Form
Kuroageha in her Insect-Human form is the one closer to her original. Her hair color returns to its former color but her eyes turns from green to purple. Her white clothes turns purple and she grows a pair of purple black wings.