He does hint at something like an epilogue for each of the stories. A sequel to the game in general would be tricky unless it lets you select a route or uses your save files from this one. It hurt but I did all possible ends for Harold.
There is one free but the epilogues are kind of dark. It gives you a look at the aftermath depending on decisions and you may know of it already. Echo. If you find any VNs with happy epilogues let me know.
