JJK x BSD

You are a Port Mafia member, but you and the others start to see odd creatures all around the office. You've tried to kill them, but nothing works. Out of extreme desperation, Mori finally decides to ask the agency. But oddly enough, the Armed Detective Agency has been having the same problem. One day, you see something that mentions cursed spirits and cursed techniques as ways to kill them. The Port Mafia and Armed Detective Agency decide to start learning the techniques to get rid of the monsters.