Sekai Project hosted a panel at Anime Expo 2015 which revealed upcoming visual novels, as well as a few release windows for those fans have been waiting for. Here's the full list of announcements, along with trailers when applicable.

First was The Devil on G-String (G-senjou no Maou). It's planned to hit Steam this summer, though they'll have more information once Otakon rolls around.

https://www.anrdoezrs.net/links/3607085/type/dlg/sid/UUhgUeUpU44053/https://www.youtube.com/watch?v=o2qBNsS65RU

The next surprise reveal was time-travelling tale Chrono Clock. Although the game itself is 18+, the video isn't, so you can feel safe watching it wherever. Because there is no all-ages release, it probably won't ever grace Steam.

https://www.anrdoezrs.net/links/3607085/type/dlg/sid/UUhgUeUpU44053/https://www.youtube.com/watch?v=0tLP_5_O4kc

Root Double -Before Crime *After Days-- Xtend Edition- was actually leaked shortly before the panel began. In any case, Sekai Project shared that there would be more information "arriving soon."

https://www.anrdoezrs.net/links/3607085/type/dlg/sid/UUhgUeUpU44053/https://www.youtube.com/watch?v=hdwKxuogBbk

Last but not least on the new game front was Narcissu 3 being announced for western release. Not only that, but 1 & 2 will be remade as well. The first two are already available on Steam for free.

https://www.anrdoezrs.net/links/3607085/type/dlg/sid/UUhgUeUpU44053/https://www.youtube.com/watch?v=BMrd2Vpr9DY

With all those new announcements out of the way, here's just a bit more about the other games discussed. World End Economica Episode.02 is coming out later this July on Steam! Sekai Project also formally showcased Sunrider: Liberation Day though they still have no release time frame for Love in Space's newest title.