Chapter Summaries

Brook urged Nami to consider joining his voyage as his steward and navigator, and she quietly wondered whether she might leave the orange grove. Back at Hogwarts, Harry considered starting a practical defense group, and Brook agreed to lend his fame to help him recruit students.

• Brook offered Nami a role managing his treasure and navigating his ship, and she said she would think about leaving the village.
• Brook asked Nojiko to watch animals he had brought from the ring, captured pirates as test subjects, and used a potion before returning through the Rift Door.
• Brook returned to the Gryffindor common room and told Hermione he might be able to take her on future trips if his travels became stable.
• Harry told Brook, Hermione, and Ron that Draco had suggested he form a group to teach practical defense against the Dark Arts.
• Ron proposed using Brook's fame to recruit students while Harry began as an assistant instructor, and Brook accepted the idea of helping his friend.

Brook and Hermione joined Harry, Ron, and students from across Hogwarts at the Hog's Head Pub to discuss a practical Dark Arts club. Brook agreed to teach three lessons, and the gathered students began asking what they would learn.

• Brook agreed to give Harry up to three lessons, and Fred and George organized a meeting for students from the other three Houses.
• Brook visited Japan to ask Voldemort to build a customized, armed mini warship with room for about twenty people.
• Brook and Hermione went with Harry and Ron to the Hog's Head Pub, where Aberforth Dumbledore served Brook without charge.
• Fred and George brought twenty-eight student representatives to the pub, and Brook announced plans for a practical Dark Arts club.
• Ginny asked Brook whether the club would cover material beyond the textbooks, including the Clothes-Exploding Curse.

Brook gathered Hogwarts students and provoked them by saying he wanted to make them his private army, then showed how far training with him could take them. After Ron defeated Zacharias without using a wand, Brook clarified that meeting his standard would never obligate anyone to join him.

• Brook refused to teach Ginny the Clothes-Exploding Curse but told her Harry could teach it, then introduced Harry as his teaching assistant.
• When Zacharias Smith demanded to know Brook’s purpose, Brook claimed he wanted to make the students his private army and openly challenged their abilities.
• Brook arranged a wandless duel between Ron and Zacharias, creating an arena in the bar with magic.
• Ron dodged Zacharias’s spells, disarmed him in close combat, and won the duel to the crowd’s applause.
• Brook said Ron was the weakest person by his side, and Ron protested while Hermione offered to spar with him.
• Brook told Cho Chang that students who met his standard could choose whether to join, and said effort was part of the selection process.

Brook helped organize secret defensive lessons for Hogwarts students, but Umbridge’s new decree threatened the group before its first class. Hermione, Harry, and Ron kept the plan alive, while Brook suggested teaching the Disillusionment Charm first.

• Brook and Hermione organized a group of twenty-eight students to learn defense in the Room of Requirement and teach others in their houses.
• Brook had the students sign a Secrecy Contract, then told Hermione that Harry would handle the group’s details.
• After Brook left the pub, Aberforth found the message “Credence has recovered” on Brook’s bottle and laughed wildly.
• Umbridge posted a decree banning unauthorized student groups, and Hermione, Harry, and Ron agreed to keep their lessons secret and continue preparing.
• Brook returned from inspecting his ship in Japan and proposed teaching the Disillusionment Charm at the first lesson.
• Hermione said she had made a device to notify the students about the lessons.

Hermione explained how the enchanted fake Galleons signaled meeting times, while Angelina secured the Gryffindor Quidditch team's approval to compete. Brook opened the first Dark Arts group meeting in the Room of Requirement, where the students named themselves the Guardian Alliance (G.A.) and began practicing the Disillusionment Charm.

• Hermione showed Ron and Angelina how the fake Galleons changed their numbers and heated up when the next meeting time changed.
• Angelina worried Umbridge would block the Gryffindor Quidditch team, but Hermione explained why Umbridge would approve its application, and the application was approved.
• Brook summoned a training room on the Seventh Floor, and the gathered students explored its bookshelves and magical instruments.
• Ginny proposed giving the group a name, and the students unanimously chose Brook's suggestion, the Guardian Alliance, or G.A.
• Brook taught the Disillusionment Charm, Harry demonstrated it, and Harry, Hermione, Ron, and the twins helped the others practice for two hours.

Brook ended the G.A. gathering and returned to the One Piece world to retrieve Nami. After finding the livestock he had left behind unusually grown, he wondered whether the world could enhance living creatures.

• Brook ended the G.A. gathering with a group Disillusionment Charm and warned the students to learn their spells or risk detention and his Hair-Loss Curse.
• Ron asked Hermione for help reviewing spells, while Harry reflected on how much he enjoyed teaching his classmates.
• Brook received his miniature battleship and discussed testing the Rift Door with Voldemort and Eula before traveling through it.
• Brook arrived at the orange grove, where Nami and Nojiko greeted him, and Nojiko revealed that Nami had secretly packed to go with him.
• Brook inspected the livestock and found the cattle and sheep unusually large, prompting him to suspect that the One Piece world could boost living creatures' growth.

Brook formally invited Nami to join his crew, and she accepted before leaving Cocoyasi Village with him. He revealed a high-tech warship equipped with orange trees from her family’s grove, and Nami began exploring its unfamiliar systems.

• Brook teased Nami until she accepted his invitation to join his ship as its navigator, completing his recruitment mission.
• Nami said goodbye to Nojiko and the villagers, stealing their wallets as her farewell gift before leaving with Brook.
• Brook summoned a massive silver-gray warship offshore and teleported Nami onto its deck.
• Brook showed Nami orange trees he had taken from her family’s grove, and she became emotional before following him to the control room.
• Nami discovered the ship’s weapons, escape helicopter, and surveillance radar, then declared the vessel incredible.

Brook and Nami sailed to Baratie, where Brook hoped to find a cook and sample the restaurant’s food. After arriving, Sanji flirted with Nami before Zhepu sent him back to the kitchen.

• Brook chose Baratie as their destination, and Nami navigated the warship toward it.
• Brook showed Nami the ship’s enormous dining hall and luxurious bedroom, then gave her his gold-filled room when she claimed it.
• Nami navigated the warship to Baratie, and Brook made it disappear before they entered the restaurant together through the air.
• Patty seated Brook and Nami, but Brook’s request for one serving of everything conflicted with the restaurant’s rule against wasting food.
• Sanji knelt before Nami and offered to share lunch with her, but Zhepu slapped him into a wall and ordered him back to the kitchen.

Brook and Nami dined at the Baratie, where Brook persuaded the system to assign him a mission to recruit Sanji in exchange for beginner Haki awakening. He challenged Sanji to join his ship, but Sanji refused, and Zhepu demanded to know who Brook really was.

• Brook and Nami ordered a lavish seafood meal, and Brook marveled at the food while Nami ate enthusiastically.
• Brook pressured the system until it issued a mission to recruit Sanji, rewarding him with beginner Haki awakening in three types.
• Nami snatched the last piece of lobster from Brook, and Sanji served her a special lychee rose drink.
• Brook teased Sanji by calling him Curly Brows and provoking him about his lack of experience at sea.
• Brook directly invited Sanji to join his ship as its cook, but Sanji said he could not leave.
• Zhepu stopped Sanji and asked Brook who he really was.

Brook challenged Sanji and persuaded him to join the crew by invoking All Blue, while giving Zhepu a magical prosthetic leg. After Sanji accepted, Brook received beginner-level Haki and lost control of his Conqueror’s Haki, knocking out everyone in Baratie except Zhepu before Brook fainted.

• Brook endured Sanji’s kicks, then threw him and asked him to join the crew.
• Brook reminded Sanji of All Blue, but Sanji initially refused to leave Zhepu.
• Zhepu offered to fight Brook and urged Sanji to pursue his dream, but Brook immobilized him and created a flexible prosthetic leg for him.
• Sanji accepted Brook’s invitation to join as the crew’s chef.
• Brook received beginner-level Haki from the system, lost control of his Conqueror’s Haki, and fainted after everyone in Baratie except Zhepu collapsed.

Brook woke in a hospital in Rogge Town after five days unconscious, discovering that his magic had fused with Haki and greatly increased his strength. He reunited with Sanji, and the three began shopping in town the next morning.

• Brook awoke in the hospital and realized his magic had turned black and grown stronger after fusing with Haki.
• Nami told Brook that Sanji had been working to earn money for his medical bills, and Brook went with her to find him.
• Brook and Nami ate at the tavern where Sanji worked, and Sanji joined them after finishing his shift.
• Brook promised to pay for their shopping, gave Sanji five million Beli for supplies, and the three planned to shop around Rogge Town.
• Sanji headed to the seafood market while Nami pulled Brook into a store on the commercial street.

Brook and Nami went shopping in Loguetown before Brook bought every sword in a secondhand barrel, including Sandai Kitetsu, and was confronted by Marines over a false bounty poster. Brook sent Nami away and defeated most of the Marine squad with Conqueror's Haki, then faced Smoker's attack.

• Nami tried on dozens of outfits with Brook, but bought only a few light summer clothes.
• Brook and Nami visited the execution platform, then went to Ippon-Matsu, where Brook bought all twenty-two swords in a barrel for 1.1 million Beli.
• The shop owner revealed that Sandai Kitetsu was among the swords, while Marines surrounded Brook and Nami outside and Tashigi accused Brook of attacking Marines and slaughtering civilians.
• Brook sent Nami away through a Space Gate as Tashigi ordered the soldiers to fire, then knocked down nearly all of them with Conqueror's Haki.
• Smoker attacked Brook with White Blow, and Brook used enhancement spells to withstand the strike.

Brook defeated Smoker, learned that Captain Nezumi had framed him, and infiltrated Marine Base 16 to kill the corrupt captain and other abusive Marines. He left Nami and Sanji at the Baratie while his punishment of the base continued under cover of night.

• Brook fought Smoker in the harbor, adapted to his attacks, trapped him with a Cube Barrier, and knocked him unconscious with a Stunning Spell.
• Brook used Memory Gate on Smoker and discovered that Captain Nezumi had framed him after Brook disrupted Nezumi’s collusion with Arlong.
• Brook reunited with Nami, explained the framing, and left her and Sanji at the Baratie.
• Brook infiltrated Marine Base 16 at night and silently killed corrupt Marines who were gambling and abusing a civilian.
• Brook killed Captain Nezumi in his sleep with Avada Kedavra and stunned the two women beside him.

Brook found a Devil Fruit in the Marine base’s treasure room and offered it to Sanji as the Golden Scale departed Baratie. Sanji ate the Scent-Scent Fruit, gaining the ability to give off others’ favorite scents and enhance aromas, while Brook told Sanji and Nami he would return to his hometown for classes.

• Brook found a heart-shaped pink Devil Fruit among the treasure in the Marine base and stored it with the loot.
• Sanji said farewell to Zhepu and the Baratie chefs, then sailed away with Brook and Nami aboard the Golden Scale.
• Brook told Sanji and Nami he was still a student in his hometown and would return to them during his days off.
• Brook gave Sanji a Devil Fruit, explaining that he had prepared a more suitable one for Nami on Sky Island.
• Sanji ate the fruit and discovered he had gained the Scent-Scent Fruit, which let him produce favorite scents, intensify aromas, and detect faint smells.

Brook left Sanji and Nami to sail toward Twin Cape while he returned to Hogwarts, where Hermione told him that Umbridge wanted to see him. He learned that Harry had successfully led the second defensive magic gathering.

• Brook explained how Sanji could develop the Scent-Scent Fruit for tracking and group attacks, then told Sanji and Nami to sail to Twin Cape without attacking the enormous whale there.
• Brook opened a Space Gate and left Sanji and Nami to begin their voyage toward the Grand Line, promising to return in three weeks.
• Brook returned to Hogwarts, reassured Hermione that he was unharmed, and heard that Snape had threatened him with a term of stewing toad intestines if he skipped class again.
• Hermione told Brook that Umbridge had learned he left school and wanted him to report to her office, but Brook dismissed the demand.
• Hermione told Brook that Harry had hosted their second gathering and successfully taught Expelliarmus, even winning Zacharias's cooperation.

Brook confronted Umbridge over his unauthorized absence and warned her that he might join the Ministry if she kept causing trouble. He then taught the G.A. advanced applications of the Levitation Charm, leaving the students eager to rethink the spells they already knew.

• Brook told Umbridge that he had informed Dumbledore about his absence and reminded her that Fudge had invited him to join the Ministry after graduation.
• Brook left Umbridge's office, and she smashed a teacup after the door closed.
• Brook returned to the Room of Requirement and asked the G.A. students to consider what the Levitation Charm could do beyond floating feathers.
• Brook demonstrated flight, the use of levitation to tear apart a dummy, and how invisible Levitation Charms could surprise opponents.
• Brook showed the students how levitating knives could serve as both an attack and a defense, then demonstrated advanced techniques that drew on the charm.

Brook taught the students advanced uses of the Iron Armor Curse and Sensing Charm, explaining how Magic Resonance could predict spells and help someone learn by imitating magical flows. Neville successfully awakened the technique and used it to learn to fly, leaving the gathering astonished.

• Brook demonstrated the Iron Armor Curse and explained that its variants could defend against most forms of the Levitation Charm.
• Brook taught the students Iron Armor Embodiment, Multiple Iron Armor, and how the Sensing Charm could develop into Magic Resonance.
• Brook showed that Magic Resonance could predict an opponent's spell and imitate another person's magical flow to learn spells faster.
• Brook guided Neville in sensing and imitating Harry's magic as Harry cast the Flying Charm.
• Neville imitated the magical flow and floated into the air, earning applause and an excited hug from Ginny.

Brook joined Gryffindor as a Chaser against Slytherin and dominated the opening minutes of the Quidditch match. His scoring spree overwhelmed Slytherin as the game continued.

• Brook limited Magic Resonance training to his future core group and left Harry in charge of later G.A. lessons while he and Hermione stopped attending.
• Professor McGonagall persuaded Brook to play in Gryffindor’s first match, and Brook promised to guarantee victory.
• Brook took the field as a Chaser alongside Harry, surprising the crowd and prompting Angelina to rally the team.
• Brook opened the match with a goal, stole the Quaffle twice, and helped Gryffindor reach 30:0 in under three minutes.
• Brook continued scoring about once a minute, breaking through Slytherin’s formations and turning the match into his personal showcase.

Brook dominated his farewell Quidditch match against Slytherin, while Harry let Draco catch the Snitch to preserve Slytherin's dignity. After the match, Brook asked Professor McGonagall for flexible leave, and she arranged a meeting with his professors over a meal at Hagrid's Hut.

• Brook's play carried Gryffindor to a 600–0 lead while Harry stalled Draco, then Harry allowed Draco to catch the Golden Snitch, ending the match 690–150.
• Hogwarts celebrated Gryffindor's record-setting victory, and students learned Brook would not play in future Quidditch matches.
• Draco thanked Harry for letting him catch the Snitch, and Harry explained that Brook had planned for Slytherin to take it.
• Brook asked Professor McGonagall for flexible leave, and she agreed and summoned the professors whose classes would be affected.
• Professor Sprout and An An served food at the leave approval meeting in Hagrid's Hut, where Snape enjoyed several slices of Erumpent sashimi.

At a dinner with the professors, Brook received approval for flexible leave from school and learned that Hagrid was returning from his mission. Brook went to find Hagrid, treated his severe injuries, and discovered that Hagrid’s younger brother Grawp had caused them.

• Professor McGonagall proposed approving Brook’s flexible leave, and the professors agreed after Brook offered Snape a bottle of unusual blood.
• Professor McGonagall told Brook that Hagrid was safe and on his way back, so Brook used a Space Gate to find him.
• Brook found Hagrid badly injured outside a dark cave and used potions to stabilize him.
• Brook asked who had hurt Hagrid and learned that the injuries had not been caused by the giants.
• Brook saw a huge figure inside the cave and realized Hagrid’s younger brother Grawp was responsible.