Hey it got me into anime again...and Akibaranger, and by extension Jetman.
Plus I'm a sucker for love stories, at least like this where it's cute and comes off genuine if albeit weird.
Kotobukiya hasn't announced anything else yet, but if Rikka and Deko do well I imagine we'll at least get Shinka and Kumin. Hoping for a Yuuta too if only to go along Rikka...plus his voice actor is the same as Baron Nero, could probably make a few joke with that.
There is also another character the has a high chance of getting made, but I can't mention them since I don't wanna spoil too much for you.
As for Touka, that's anyone's guess. Oh btw, I have the first two lite novels translated if you want them.