What constellation is Dihara Sayou?

Shayou is not dirty. Dihara Shayou), light novel Shayou. Then I found a female high school student. And the heroine in its derivative works. Female high school students born in Hokkaido run away from home for some reason, and their values are gradually distorted. They moved to Tokyo and met Yoshida, an office worker, who took them in. Under the influence of Yoshida, their lives are back on track.