S1 No. 1 Style
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| Industry | Pornography |
|---|---|
| Founded | 2004 |
| Headquarters | Meguro, Tokyo, Japan |
| Products | Pornographic films |
| Parent | Hokuto Corporation |
| Website | s1s1s1.com |
S1 No. 1 Style (エスワン ナンバーワンスタイル?) or just S1 (エスワン) is a Japanese producer of adult videos (AV) which has its offices in Tokyo's Meguro Ward.
S1 is one of the many affiliated companies in the giant Hokuto Corporation group. Hokuto distributes the studio's videos via retail sales and online through its DMM website. The Public Relations representative for the studio is Megumi Yamane (山根愛美).
The studio's website, s1s1s1.com, has been online since June 30, 2004 and their first videos were released in November 2004 starring AV Idols Sora Aoi and Alice Ogura along with the simultaneous debut of eight new actresses: MEW, Mami Hayasaki, Kaya Yonekura, Chihiro Hara, Kanan Kawai, Akane Mochida, Rin Hino and Misato Shiraishi. All Japanese adult videos are censored by applying a mosaic over the genital areas but in late 2004, S1 was the first company to replace the old analog mosaics with a new thinner digital mosaic they named "girigiri" or risky mosaic (ギリギリモザイク girigirimozaiku?).
In celebration of its 5th anniversary, S1 organized a special puroresu event with All Japan Pro Wrestling, which was held on January 22, 2010 at Korakuen Hall. The main bout of the event, named the Akiho Yoshizawa Cup after the popular idol of the studio, featured several prominent wrestlers such as Keiji Mutoh, Masakatsu Funaki, TARU, and Ryota Hama.
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