From DokiDoki: Launching in April of 2009, DokiDoki is a special co-publishing line exclusively between popular Japanese publisher SHINSHOKAN and U.S.-based publisher DIGITAL MANGA. The DokiDoki line is essentially, "The Gateway from Shojo to Yaoi," with stories varying between shojo and shonen-ai to yaoi, and will be for ages anywhere from 13+ to 18+.
