Here is from Nekonyan's blog late March regarding Dracu Riot. So a HD remaster seems to be what is holding it up at the moment.
"Wow, this list got pretty short, huh? Wait I think I’m missing one… Oh, right! I guess this is a good place to start for today. Dracu Riot, huh.
You guys have been waiting very patiently for a really long time for this game, and we know you want to know what the holdup is. We’ve seen the comments don’t worry. There IS a reason for it, however, and we can finally talk about it now!
The truth is… Dracu Riot is getting a full HD Remaster and re-release in JP as well as in English!
Fortunately, Yuzusoft had the original super high res assets, so we’re going to be working on getting the entire game rebuilt from the ground up with high res assets and a new UI. It will be on our Unity engine and receive a total upgrade, including the same features you see in newer Yuzusoft projects, voice bookmarking, and more! Meow is currently working on the Clover Days port, once that is complete, he will begin the work of porting and implementing the new features for Dracu Riot!
Hopefully, this will make it worth the wait for you!"