Saul gets a very strange series of calls demanding he provide his services to a client in Tokyo who is currently on trial. He winds up in Hiromi’s Domain Expansion.
Round 1: Can he successfully defend Yuji in court from the same charges levied against him by Hiromi.
Round 2: assuming Fushiguro had ended up against Hiromi instead. Can Saul defend him for his actions during Shibuya (summoning Mahoraga, etc)
Round 3: If Saul can somehow achieve both of these, he had to try and defend Sukuna in court for the Shibuya Incident.
Saul has access to all resources and connections in the show, including Huell.