Today, Area-X got released on Steam. The game is blend between a visual novel and adventure game. As for the story, the setting is based in a far future about a girl on a time traveling adventure. Price is $24.99 or ¥3095.14.
According to the developer on the Steam forums, the price is justified because the game has much longer content than their other visual novel called X-note (also available on Steam) and will have a coming free DLC along with other Steam features. For more details, check out the store page and official website. Here's a trailer.
Official Website: http://zeiva.net/otome/area_x_story.html