After you've done all three plotlines listed in the previous subsection, do these to get to the end of the game. Note that you can do the first step or so without having done any of the "Mako Sochou" quest, but soon you'll be forced to go back and do the things you missed. So, to keep things as easy as possible to follow, you should just try to do things in the order listed. If nothing else, it's fun to have Harlequin give you a little clue, only to have you say, "Oh, yeah, I already took care of that. Where have you been?"