Those types of games, i mean the ones with "open" locations instead of being pure VNs, tend to have same problems of being not obvious at all. This one is not exception, i'm afraid.
I mean, its one thing to have choice, its another to need clicking everything i see in the hope of progressing the story.
Aside from delivery job everything else says no more content, despite me not yet seeing most of the stuff displayed here on this page. You really need to work on game explaining mechanics better.
Exploring the town is, largely, additional content from my understanding. Simply staying within the hotel and interacting with the girls, doing their events, is what leads to progressing through the story and seeing the majority of events within the screenshots on the page.
Edit: I do think it would be good, however, if the game were a bit more forthright with that information if it wasn't already.
I am not saying things are perfect, nor anything remotely like that. Merely that the information is out there; it's upfront. I was quite clear in my wordage about that.
I'll address the presented information from the game further, then: the second screen showcases "quick tips," this is largely a brief summary and not all that clear; after the introduction there is a more proper guide that explains in more details, it's fairly nice and explains the information well enough (at least for me to understand things clearly, I cannot speak toward new players nor those with difficulties toward whichever language they are playing in). The latter tutorial can only be viewed once, which is rather problematic and should very much be changed to include an option to view at any point or perhaps when not within a scene.