Yea they're on going. The second one takes place a few years after the first on a different tower. (SPOILER)One of your party members in the second one is a very prominent figure through out the first game.

And I would recommend that you play them. They're both really good and pretty easy so it doesn't take long. It's very character driven and you have to read a lot. Especially in the second game. Also lots and lots of innuendo.