There's this app called VNDS that was ported from the DS, it's a sort of engine that can run visual novels that have been ported to it. A few of popular visual novels have been ported, off the top of my mind this have been ported:
Fate/Stay Night
Tsukihime
Higurashi
Umineko
Ever17
Never7
Saya no Uta
Narcissu 1 & 2
Here's the play store link to the app
You need to download and convert the games by yourself though, here's the link to some of the converters
There's also a Katawa Shoujo android port and an almost complete translation for the play store version of Steins;Gate IIRC
Thanks for the heads up, are Never7 and Ever17 in English though?