The reason why the game started here is that it's easier for me to render outside scenes on the hardware I have. Bianca will have her story told since she just "appeared" there, plus I'll also post a family tree soon so you can get an idea what the canon relationships are and how they are suppose to be. Shiji is the only character that is "out of place" for now.
Regarding the DLC page, there you will find the bonus content, free DLC scenes and own personalized scenes, but that's for later, and in the next releases Episode 1 will continue. The Episode 2 will make a difference based on your tunnel decision, and you'll get more backstory about it.
The "Surprise Her" choice was a "mistake" and didn't suppose to be there, yet. There are still two choices that are not implemented yet for this update, but they will be present in the next update.