There's no story to end. The game so far is just trying to answer the question "how many Marvel characters can I fuck?" and the answer is as many as patrons will pay oni to put in the game. It would make sense to want to see the ending to a story or arc, but to expect a definitive ending to what is essentially just a parody harem simulator is nonsense. There's nothing in this game to end. There's no narrative building up to any kind of ending. It will be finished when the dev is done working on it. That's it. It isn't more complicated than that because there are no (and probably will never be) any loose character development or plot threads to finish up or drop. Since there's no narrative here, there's no end to expect. There have only been two attempts to add any narrative structure to this game, and one was promptly abandoned to get to lewd content and the other had poor community reception, so it seems unlikely that the dev will ever even put on a pretense of any kind of narrative structure to events or character introductions again. The dev is giving the people who pay them what they want, which seems to be to keep adding characters until their favourite is in so they don't have to update the game anymore. If you're happy with the characters you can hook up with so far and don't want to wait around for more, there's no narrative hook to keep coming back looking for a conclusion to, so why are you?