Chapter 3 of the Jigokuraku manga.
After arriving on the island, Gabimaru tells Sagiri of the Iwagakure Chief's immortal body and how the Elixir of Life may actually exist, though he doubted it may be on the island because of the unnatural environment. He then frees himself of his restraints but Sagiri refuses to allow him to do whatever pleases him. Gabimaru agreed to the terms and is then hit by a surprise attacked from Warped Keiun. He then notices that the criminal's arms were not restrained and complained to Sagiri. Sagiri questioned Yamada Asaemon Kishō as to why he wasn't following the rules, only for the Asaemon to reply saying that the rules are not necessary. Keiun charges at Gabimaru and attacks him with a barrage of weapons, however, they had no effect while Gabimaru was tying his hands together. Gabimaru then lifts the giant upwards and kicks his spear towards him. Keiun manages to survive after revealing that he was wearing armour underneath his clothing. He prepares himself to fight Gabimaru once more, but is later killed by the bored ninja. Gabimaru tells Sagiri that he wishes to move on a find the elixir but then spots Kishō drawing out his sword.