A dreary pall of despair is immediately cast on the second half of Kabukicho Sherlock as Watson, Sherlock, and Mrs. Hudson visit James in prison. He’s trying to keep a brave face, but there are clear signs he’s receiving beatings from other inmates.
It’s gut-wrenching to see such a bright kid of such potential to help people behind bars, but he doesn’t try to run away from the fact he chose to murder Jack, and this was the consequence.
Mycroft pays a visit to Holmes’ house and thoroughly examines it, while a client-of-the-week arrives with a murder case. As Sherlock starts to unravel the case on the spot, Watson is happy his friend is able to stay busy.
Mycroft tells Watson how Holmes left his accomplished family for Kabukichou because he was missing something very profound at home. It was a void he was able to at least partially fill in his new role as detective and performer of mystery-solving rakugo.
It turns out that rakugo was James’ idea, suggested to Sherlock soon after the two met quite by chance (the fact that Sherlock’s brother was James’ father’s secretary for five years was mere coincidence). When his mother took her life and even before losing his twin sister to Jack, James had a similarly large hole in his heart that Kabukichou and the people in it managed to fill.
Now he feels alone again, as his attackers in prison grow more brazen and one of his protectors being beaten half to death and being released early. It’s just a horrible situation all around. No matter how many cases Sherlock solves, as long as James is in prison (and danger) the emptiness and despair will always creep back into the spaces between the cases.