A bondage-themed doujin circle created by Izumi Aoi and Reizei.
- Circle name: サイクロン (CYCLONE)
- Old circle name: スタジオ彩 (Studio Aya)
- Website: http://cyclone10.com/
- The other URL (1): http://www.cyclone10.com/
- The other URL (2): http://fuji.sakura.ne.jp/~cyclone/
- Old website(closed): http://www.cyclone.sakura.ne.jp/
- Digital distribution site: DLSite.com (JP / EN)
- Current leader, current webmaster, main artist (female): レイゼイ or 冷泉 (Reizei)
- Blog: http://tycoon31reizei.blog54.fc2.com/
- Pixiv account: http://www.pixiv.net/member.php?id=2324925
- Twitter account: http://twitter.com/cyclone_reizei
- Former leader, former webmaster, coloring artist (male): 和泉 葵 (Izumi Aoi) or 和泉 (Izumi)
- Former member, programmer: 緋泉 (Hiizumi)