The gallery is where the heart is? Are there any hints on what to do next? The plot is supposed to end soon, but there is no development from the girls (I spent time with everyone and talked and nothing changed, the last event was when I played with them for the second time on the console, there was Mary, is there any future interaction with her or is that all for now)
In the gallery located in the main menu, you can view scenes, including the ones that are still locked.
If you're talking about Oni, and the last thing you did with her was the gimp scene, then yes — there are more events with her.
The next one starts in her room after you've played the gimp scene a second time and have more than 25 relationship points.