helooo!!I commented on a Fickles post, above, on how to get the fifth SMC star.
So for the last of shadow, you must do the polyamorous route and when I offer you to buy the chocolate, you do it. To later, go after SMC, he doesn't forgive you, but before he leaves you must play his soul jam three times, leaving the scene. And that's how you get it, I don't know if chocolate is so necessary, but that's how it worked for me, the important thing is to play the soul jam.
I hope that it works for you! ;3