13 is easy to follow if you read the 'Data Entry updated' on a regular to understand what just happened and a bit more info that is mostly explained via text (stupid imo). If not, then the game is pretty confusing as you'll question a lot of things.
13-2 is kind of confusing but I believe it's a bit of the same way, read what they give you but still confusing.
14 is an MMO and you can easily follow the story by reading and not skipping a cut scene, really not hard to follow if you pay attention. It's not that confusing either, you can sort of get a grasp of whats going on by rushing through dialog.
Can't say for 15, unfortunately.
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