Lesson 511 is the 511th chapter of the Gintama series.
Surrounded by several members of the Yato Tribe, who started attacking the Yorozuya, the Shogun, Kondou and Hijikata, Kagura began the fight by throwing a huge boulder at them. When the Shogun was caught by the ankle by a Yato, Shinpachi stabbed him and ran away with the Shogun.
Meanwhile, Kagura was fighting with another Yato, who was about to hit her, when Kondou injured him from the behind. He later stabbed two other Yato people. One of those two tried to injure him with his umbrella, yet both of them were killed as soon as Kagura pushed them down the cliff.
As of Gintoki and Hijikata, they were also fighting against two Yato people. Another of them went after the running Shinpachi and Shogun. Hijikata killed him by throwing his own sword. As a result, he was beaten by his current opponent. Gintoki tried to kill that Yato, but he ended up being attacked from the behind by another Yato.
In the end, the swordless Gintoki and Hijikata faced their Yato opponents, seemingly preparing to be beaten by them. Nevertheless, the Shogun helped the duo by throwing kunais at the Yato people. Having picked up their swords, they stabbed their enemies at the neck, thus killing them.
Characters in order of appearance