Chapter 558

Chapter 558 is called "Younger Brother".

Coverstory Summary
Brook is seen writing a song for the people who believe that they have summoned him, with followers of the cult flashing Brook with their own undergarments.

Summary
The chapter begins with Luffy telling Whitebeard of the new plan to execute Ace ahead of schedule. Luffy sets off towards Ace, while Ivankov wonders why Luffy would be talking to Whitebeard as if they were equals, also questioning the origin of Luffy's confidence. Whilst Whitebeard ponders the Marine's next move, Marco appears in front of him, reporting that the Marines intended to execute Ace ahead. Whitebeard replies that he knew, and to remain calm. He suggests that the Marines new move was to upset the Whitebeard Pirates as he believed that Sengoku would not allow such a plan to be overheard so easily. Kizaru appears, stating that the Tenryubito had demanded the arrest of "Strawhat Luffy" after the Sabaody Incident and prepares to attack him, his foot shining with light. The Impel Down pirates look on, deeming Luffy dead. However, Iva uses his Devil Fruit and uses his signature move, Death Wink to interecept the blast from Kizaru. Buggy and his band of escapees shout that they all wanted to go home. However, the escapees mistake Buggy to say "I want to kill Kizaru". They are all in awe, saying that "crews of legends" had no fear of the Admirals. Mr. 3 shouts at them, saying that their ears were "filled with too much hope". Luffy thanks Iva, when the latter notices another beam, taking it for Kizaru. Iva uses Rolling Estute to get out of the beam fire. When the dust clears, Kuma appears to have shot it, to Iva's surprise. Iva thinks to himself, even though Kuma was thinking of his role as Shichibukai, how could he fire upon an old friend like himself?

Luffy urges on when, Hina (or to Luffy, the "girl at Arabasta") appears, using her power to create a cage. Luffy states that he was sick of being locked up and enters Gear Second, evading Hina, which causes the Marine Captain to catch her own Marines instead. Moria spots Luffy, and orderes his new zombie army to attack him, using fallen soldiers and an arsenal of shadows. Luffy prepares to fight them, when Ace shouts at Luffy to stay away. He states that both of them were pirates, and they knew better. Ace goes on to say that he had his own battles, his own nakama and Luffy shouldn't butt in. Ace calls Luffy a weakling, saying that he wouldn't forgive someone like him or rescuing him, stating it was humiliating. He tells Luffy, ironically, to "go home". Now Luffy becomes enraged and shouts that he is Ace's brother. Ace has a flashback, when he once said "If we have a drink together, we will be brothers" and both of the younger versions of the duo laughing and smiling.

Marines begin to question Luffy's parents, mistaking him for a son of the former Pirate King. Moria seizes this chance, urging his zombie soldiers to attack. However, they are all purified. The reason becomes clear, with Jinbei standing wet of seawater, remembering that salt wastheir weakness. As a giant with a mace begins to attack Luffy, Sengoku shouts that Luffy was also to be taken down, as he is the son of "Revolutionary" Dragon. This surprises everyone again, with reporters calling their HQ to inform their bosses. Buggy, Mr. 3, and Moria are shocked. Coby and Helmeppo are surprised that Sengoku revealed Luffy's heritage. Mihawk states that at this point, the news wasn't very surprising; Hancock still loves Luffy, claiming she wouldn't care if he was "the son of demons", and Kuma says nothing. Doflamingo laughs, finally figuring out the answer why Emporio Ivankov was at his side. Jinbei pieces everything together as does Smoker, who also finds the answer to the incident at Loguetown. Garp, the father and grandfather, states that he no longer needed to hide it, stating that Luffy had already aquired such an infamous record, titles and labels may as well mean nothing.

Luffy activates Gear Third, just as the giant appears to be giving the final blow. Luffy sends the giant flying with Giganto Rifle, winning the applause of many Whitebeard's men. Luffy then shouts that he would save Ace even if it killed him. Whitebeard, amused by Luffy's actions, tells Marco, that if the boy [Luffy] was to die, then he would not forgive him. Marco takes in his new order, ending the chapter.

Chapter Notes

 * Sengoku informs the world of Luffy's heritage.
 * Kuma and Ivankov are revealed to have a certain history or friendship together.
 * It appears Whitebeard has taken an interest in Luffy in his final statement of this chapter, possible due to his newly revealed heritage and devotion to Ace.

Quotes
You should know better!!! We are both Pirates!!! We have both sailed the seas!!! I have my own adventures!!! I have my own nakama!!! You shouldn't butt in!!! You're such a weakling!!! You think I'll forgive someone like you for rescuing me!!? This is humiliating!!! Go home Luffy!!! Why did you come!!? Please Luffy... I don't want to drag you down with me...!!! This is my mess... -Ace, to Luffy Ace! I don't care what you say!!! I'm going to save you even if it kills me!!! -Luffy, to Ace in Marineford Marco...I won't forgive you if you let that boy die! -Yonkou Whitebeard talking to his First Division Commander, Marco, referring to Strawhat Luffy