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While you may know them best for games like Ikaruga and Sin & Punishment, Treasure also developed side-scrolling shooters like Silhouette Mirage back in the day. Working Designs were the company that localized and brought the game overseas.
The PlayStation version of Silhouette Mirage (the game was originally for the Sega Saturn) is now up for download on PSN in Japan for 600 yen. As always, Hardcore Gaming 101 is a fantastic resource for reading up on games like these.