Board Thread:Questions and Answers/@comment-24573865-20141214193952/@comment-8656-20141216204351

Again, there is no separate IM content included with HF - it's all part of an integrated campaign.

Think of how Persona 4 Golden varies from the original P4. If you play P4G, the new elements (such as Marie's Social Link) are woven into the overall storyline. But there is no "classic P4" mode offered - the closest thing to that is if you try to go out of your way not to pursue any of the Golden-specific added material. (Which I would not recommend doing, to be honest.)

In HF, once you get out of the tutorial section and "back" into Arc Sophia, you can choose to ignore the Hollow Area portion of the storyline if you wish (though I don't recommend doing that either). But there is no separate "classic IM" mode you can run instead - you are still playing HF.