After building the police headquarters you can enter it via the worldmap and talk with the npc there to upgrade it. For the construction to finish, you need to leave and re-enter the map once.
Aight. I made it thanks a lot! Btw i freaking love ur game, i enjoyed it a lot! when do you think the time-skip will be done? I really want to continue this fantastic story.
Thanks, I'm happy to hear that you like it so much. ^^ I still have a lot of content planned, which I want to finish before the time skip. It might take ~2 years before I get to start the work on it.
