雛水

Yun's best friend who despite being her peer had already passed the exam and became an official angel. Hinamina had also earned the trust of the Senate that controls the heavenly world, because she often performed important tasks for them. She is serious and calm, which makes her the exact opposite of Yun. 

Translated from the url=https://ja.wikipedia.org/wiki/Monochrome_(%E3%82%B2%E3%83%BC%E3%83%A0)Japanese .