Hilariously... it was originally suppose to be a calm period. It was actually based on the day transition of like Persona 4.
But then I had some evil thoughts and it birthed whatever it is now.
You chose wrong on some choices. To help you, here are some tips
- Before every choice, save.
- Listen to the affection sound after a few dialogues after choices. It is a hint. Otherwise, Load the save before the choice.
Jin needs a bit of persuasion earlier, something along the lines of wanting to visit him later.
But TLDR: If it shows END, it is a bad ending. If it says TO BE CONTINUED, then thats the end of the update
You can comment any bug reports on the most recent devlogs as we often refer to those versions when checking for errors, along with a lot of details on the bug (Photos, what day, what route if after day 8, and what exactly is the error in detail)
Anyway, this system will be revamped on the next update cause I finally found a way to fix it
It should work if you just choose two BOTTOM options if your goal is to be topped by Koku.
For more info, please check our devlog

There actually will be. A rehaul where we add more CGs, correct some bugs, update music, dialogue, etc. TLDR; the game after 1.0 is like the beta, and 2.0 will be final with no more updates. (However, the update for this game will be extremely slow as it is mostly polishing rather than content update. The main content will not change.)