After an investigation about a weapons smuggling group in Yoshiwara, Gintoki and Tsukuyo learned that the joint forces of the Kiheitai and the Harusame were behind it. Their plan is to get as many weapons as they can to initiate their plan of attacking Edo to lure out the Tendoshu and destroy them along with it... CH6: the Shiroyasha on a rampage... Tsukuyo vs Bansai... R&R

We've seen glimpses of his past. Now we're traveling deeper into his background, as we find out his childhood, adolescent years, and what Shouyou-sensei meant to Gintoki.