Here are a few scenarios:
CULT 1
We kill Fujin and Raijin dies with his Serial Killer girlfriend. We were wrong, they were town, and we are down more townies. By the next day there's 5 Cult, 6 Town, pretty dangerous endgame. We then have to play a hard game as town and kill cult every time, especially the leader, before it's lights out. Best case scenario: 13=4C+9T -> 11=5C+6T -> 10=5C+5T -> SCREWED

CULT 2
We let Fujin and Raijin live because we trust them and do not want to lower our numbers anymore than they are already. Fujin may be recruited and shoot us all in our sleep. Fujin may shoot a cultist or cult leader while our lynchings go perfectly. Fujin may shoot a townie and put us in jeopardy. No math since it variates depending if Fujin kills or not and if she is recruited or not and if we get lucky or not. This is the biggest gamble I see.

SERIAL KILLER 1
We kill Fujin and Raijin dies with his Serial Killer girlfriend. Game over, everyone goes home. I wanted to say it could be Raijin=SK and Fu could be innocent, but Seymour got a result. Could be a naive cop, but we will see when we cross that bridge. 13=1SK+12T -> 12=12T

SERIAL KILLER 2
IT WAS SOMEONE ELSE ALL ALONG and we have to hunt his ass down and we can do this. It does not matter if we take out Fujin and Raijin because the SK will get to it anyways to protect himself from a vigilante nightkill. 13=1SK+12T -> 12=1SK+11T -> 11=1SK+10T ->...

Been typing this while caffeinated out of my head and since I posted my last post so I might have missed something. My math could be horribly wrong and I can't think. Comment.