TellTale's newest games are very easy, and they have some of the best stories to be found in adventure games. The Walking Dead is a complete five episode game (with 400 Days as a "sixth" episode add on). The Walking Dead Season 2 and The Wolf Among Us both only have two episodes so far, but both are off to very strong starts. All three games are fantastic.
A little harder but still on the easy side are Lost Horizon and Broken Age. Lost Horizon is a great game with a strong sense of adventure and well told story. Not on the level of TellTale but still very, very good. Broken Age is only half complete at this point - the other half should be out some time later this year - and it is a very charming story book like game that is not at all hard to get through. Its first half has a very intriguing twist at the end. The second half will be included in the price if you buy the first, so you have nothing to lose. I would definitely recommend both of these games as well.