Lesson 531 is the 531st chapter of the Gintama series.
Once survived from Tendoshuu's assassination, Kondou, Katsura and Matsudaira managed to escape by disguising themselves as guards, who were found dead under the hand of the Naraku. Nevertheless, they quickly found themselves unable to escape the Kokujou Island, and they had to find a safer place to hide or defend themselves while waiting for their allies.
Somewhere on a ship, the Shinsengumi-Jouishishi alliance, including Heiji and Haji, were sailing to rescue their leaders. Not long later, when they found a ship full of dead prison guards, Hijikata alerted the Alliance of being ambushed by the Naraku.
With the Alliance, Haji and Heiji almost overpowered by the attackers, the Yorozuya and Otae rescued them, as per Heiji's plan to bring them along as a reinforcement in case they were ambushed.
Characters in order of appearance
- Kondou Isao
- Katsura Kotarou
- Matsudaira Katakuriko
- Saitou Shimaru
- Yamazaki Sagaru
- Hijikata Toushirou
- Okita Sougo
- Kozenigata Heiji
- Shimura Tae
- Shimura Shinpachi
- Sakata Gintoki
- Kondou Isao: If I won't be allowed to live as a samurai, or die as a criminal I've got no choice but to do what I can as a Shinsengumi!
- Kozenigata Heiji: Every comrade of a hard-boiled guy is hard-boiled themselves.