Recently, Libra of the Vampire Princess got released on Steam and was Western localized funded on Kickstarter. The game is a visual novel about a regular boy who meets a vampire girl and then discovers his birth. Current special 10% off release price is $35.99 or ¥4010 until June 27. For more details, check out the store page. Here's a trailer.
Official Website: http://mikandijapan.com/libra/