Spoiler-Safe Summary

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Hancock's illness and feelings for Luffy come to light as she agrees to help him infiltrate Impel Down, setting in motion events amid strategic moves by powerful figures in the Summit War saga.

Full Plot Summary

spoilers

Nyon discovers that Hancock's disease is the same one that killed her two predecessors, and has Hancock meet with Luffy. Luffy requests that Hancock take him to Impel Down, and when Hancock agrees, much to everyone's shock, Nyon realizes that she is in love with Luffy. Hancock boards Momonga's ship to answer the summons, smuggling Luffy aboard inside her clothes, and de-petrifies the crew before the ship sails to Impel Down. Elsewhere, Sengoku notes that Jimbei, one of the Seven Warlords, refuses to fight and is being held in Impel Down, and learns that the 23 ships observing Whitebeard's flagship have been destroyed. Garp visits Ace in prison.