Uzaki Seiya (宇崎星夜) was the 4th grade boy that lived next to Ririka. He was a childhood friend with Ririka, and argued with her all the time. But actually Seiya started to like Ririka as a girl. Seiya's father is a doctor, and runs a hospital.

After a while, Seiya was told Ririka's secret, and he received training from Kanon so that he would be able to fight along with the Nurse Angel. Seiya can fly, teleport, etc, but he doesn't have that much attack power.