While there are a number of games originally designed for the cellphone market and a few ports, the ports are often buggy, and there are few games really designed to work well on tablets. (Technically we have a tablet version of Magical Diary but only for a really obscure tablet that nobody has.)
For people wanting to play more visual novels on tablets, this was suggested:
While as discussed above there isn't much in the way of VN's for table devices ( besides an x86 win8 tablet )
I have discovered an alternate way of playing VN's on my Ipad. I use an app called Splashtop Streamer
( http://www.splashtop.com/splashtop2 ) Essentially it's a $5 remote access app for iOS, Android (and Mac and
PC I think) It allows you to access your computer and run programs on your Mac or PC from anywhere you have an internet connection. So far I haven't had much problem using it to stream VN's to my iPad, sometimes it is necessary to screw around with the display resolution as Splashtop doesn't like full screen programs. All that being said, VN's on the iPad's retina display are bloody gorgeous.
There however are a few cons
1. It eats up my Ipad's battery life.
2. Since it's essentially a video stream that CAN'T really buffer ahead, there is the occasional hiccup where sound cuts out and stops reading inputs ( however given the static nature of VN's it isn't really a problem)
3. A little stuttery on 3g/4g
4. People give you weird looks if you're playing an 18+ scene and are in a public place.
(Not a personal recommendation on my part, I do not own an ipad and do not have any relationship with the app in question, I just thought some folks might be interested.)