A men's vow. Luffy and Kouzuki Momonosuke:
The samurai arrived at Zou seeking help from the mink tribe for the next battle in Wanokuni against the alliance between the shougun and Kaido's forces. However, both the samurai and the mink tribe have proven recently not to be strong enough, requiring to be saved by the Straw Hat crew. That's why they all now plead the pirates for help in the battle, but Luffy decides to decline. If Momonosuke is the "general" in this war, he must be the one to ask for their help. Thus, a new alliance of friendship is born between the samurai, the pirates and the mink tribe to defeat Kaido.
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