You are supposed to rinse out the nib and feed periodically. There are several ways to do it, but at least rinse the nib and feed until the water that drips out of the nib isn't obviously colored, soak it in some water for an hour or so to get even more gunk out, then put the nib point down on a paper towel or something to suck even more old ink out, and then give it some time to dry.
You don't need to do as much if you're just refilling it with the same color, but since you're running into trouble might as well rinse it out fairly well.
That just might fix the problem if it's built-up dried ink clogging up the pen.
Solid. Compared to the old anime, music isn't quite as good, bloodier, more focus on Aoshi.