Artist, illustrator.
Japanese name: オユヤミオ
Site name: 灰色のDusk
Circle name: 灰色の微笑 (The other member: Asagi Shion)
https://www.pixiv.net/users/61253
https://www.pixiv.net/stacc/yuyami
https://twitter.com/oyamichuo
https://twitter.com/oyuyamioss
https://twitter.com/intent/user?user_id=127274902
https://twitter.com/intent/user?user_id=865781999264423937
https://sketch.pixiv.net/@yuyami
http://yuyami.fc2web.com
https://bsky.app/profile/oyuyamio.bsky.social
https://galleria.emotionflow.com/114899/
http://blog.goo.ne.jp/harusame_gum/
https://lit.link/oyuyamio
https://twitter.com/oyuyamio
http://twitpic.com/photos/oyuyamio
http://yfrog.com/user/oyuyamio/photos