Chapter Summaries

Cain planned a strength-enhancing potion using Dragon Marrow and Dragon Blood, then prepared a formula requiring several rare materials. He and Wendy posted two SSS-Class Requests at the guild to find them.

• Cain told Wendy that Dragon Marrow and Dragon Blood could be combined into a potion that would greatly improve physical strength and resistance to magic.
• Cain postponed making the potion until he had worked out the formula, and Wendy mistakenly suspected his visits to Erza, Mira, and Ultear were romantic.
• The next morning, Cain gave Wendy a list of more than a hundred ingredients, including the rare Moonlight Spring, Deep-Sea Crystal, and Lava Heart.
• Cain explained how the three rare materials would purify, fuse, and temper the potion, and Wendy admired his formula.
• Cain and Wendy went to the guild and posted two SSS-Class Requests for the hard-to-find ingredients.

Fairy Tail formed three teams to pursue Cain Saint-Ciris’s SSS-Class Requests for Moonlight Spring, Lava Heart, and Deep-Sea Crystal. The teams prepared to compete over which one would finish first.

• Makarov revealed that Cain had posted three SSS-Class Requests, though he planned to search for the Deep-Sea Crystal himself.
• Laxus claimed the Lava Heart request, and Makarov let him go after confirming he had recovered from surgery.
• Ur claimed the Moonlight Spring request and recruited Ultear, Meldy, Gray, and Juvia to join her.
• Laxus invited Natsu to his team, while Erza told Lucy she would join Cain’s team to search for the Deep-Sea Crystal.
• Cain, Ur, and Laxus formed their teams and challenged one another to see who would complete their request first.

Cain and his companions traveled by submarine to search for Deep-Sea Crystals, enduring repeated monster attacks and violent undercurrents along the way. They reached the pitch-black seafloor where the crystals were supposedly found, and Cain left the submarine to investigate.

• Lucy learned that Cain intended to make potions from Dragon Blood and Dragon Marrow, and Erza showed her shields made from Acnologia's scales.
• Wendy returned from fighting another seafloor monster, and Cain noted that the group had faced an unusually high number of attacks.
• Cain estimated that they needed two more days to reach a depth of twenty thousand meters, but a violent undercurrent soon battered the submarine's magical barrier.
• After the undercurrent passed, Lucy, Wendy, and Charle went to rest while Erza stayed beside Cain.
• The group traveled calmly for two more days and reached the area where Deep-Sea Crystals were said to have been found, but saw only dark rocks.
• Cain cast Angel's Protection, swam out of the submarine, and began searching the seafloor.

Cain and his companions discovered a hidden entrance to the Deep-Sea Realm, where they met the Deep-Sea People and learned that they worshipped the Deep-Sea King. After recognizing the group as Fairy Tail Mages, Kuba appeared hopeful despite his earlier doubts that they could help.

• Cain detected a spell concealing a rock wall, touched it, and was pulled through into another world.
• Cain returned and led Erza, Wendy, Lucy, and Charle through the wall in the submarine, revealing a brilliant crystal city.
• The group found the Deep-Sea People gathered for a ritual and waited until it ended before approaching their leader, Kuba.
• Kuba welcomed the visitors, identified the realm as a world created by the Deep-Sea King, and offered them Deep-Sea Crystals.
• Wendy asked about the ritual, and Kuba explained that the people had been worshipping the Deep-Sea King, though he doubted the visitors could help with his trouble.
• Lucy introduced the group as Fairy Tail Mages, and Cain, Erza, and Wendy showed their guild marks; Kuba recognized them and reacted with delight.

Charle foresaw a terrifying Deep-Sea King, and Kuba explained that its search for Acnologia had thrown the ocean into turmoil. Cain and his friends agreed to reach the sleeping King and ring a bell to awaken it, leaving them prepared to enter the storm.

• Charle had a vision of a colossal storm-wreathed figure and trembled as Wendy comforted her.
• Kuba identified the figure as the Deep-Sea King and explained that Acnologia's attack a year earlier had disturbed it beneath the seabed.
• Cain and the others concluded that the King kept raising storms because it sensed Acnologia was still alive and remained focused on finding him.
• Kuba showed the group the storm surrounding the Deep-Sea King and explained that ringing a bronze bell would awaken it and calm the sea.
• Cain accepted the task, examined the bell, and handed it to Erza as Kuba remembered something.

Cain and his companions received the Deep-Sea Crystal from Kuba and learned that the Deep-Sea King was named Kyogre, prompting Cain to recognize it as the Pokémon creature. They traveled to Kyogre’s location, where Aquarius helped them through a massive whirlpool, and emerged into a violent storm beneath the Deep-Sea King.

• Kuba gave Cain the Deep-Sea Crystal and showed the group a relief of the Deep-Sea King, which he identified as Kyogre.
• Cain suspected Kyogre was the same creature from Pokémon, and Erza led the group to set out after Kuba revealed its location.
• Erza explained that Kuba had used magic to check whether they were good people, while Lucy realized she was the only one who had missed it.
• Cain stopped the submarine before a colossal whirlpool, and Lucy summoned Aquarius to shield it with a bubble.
• Aquarius guided the submarine through the whirlpool to Kyogre’s location, where the group emerged into a storm of lightning, thunder, and violent rain.

Cain lured the sleeping Kyogre down from the clouds so Lucy could ring a bronze bell to wake him. Kyogre blasted Lucy away before she could use it, and Cain caught her, but the bell was lost.

• Lucy and the others searched the stormy sky for Kyogre, and Cain said he would lure him down while Erza protected Lucy and helped her ring the bell.
• Cain attacked Kyogre in the clouds, drew his attention, and led him down toward the submarine.
• Kyogre chased Cain across the sea, using water tornadoes and waves as Erza, Wendy, Aquarius, and Lucy prepared for the bell.
• Erza, Aquarius, and Wendy lifted Lucy above Kyogre, but he blasted her away with a pillar of water before she could ring the bell.
• Cain caught Lucy and found her unharmed, but the bronze bell had been knocked from her hand.

Cain and his companions attacked Kyogre to break its defenses and awaken the Deep-Sea King. They succeeded, but Kyogre's reaction after waking remained uncertain.

• Cain reassured Lucy and told her and the others to unleash their strongest attacks once he shattered Kyogre's defenses.
• Lucy reconciled with Erza and Wendy, then summoned Gemini to help her prepare Star Map Chronicle.
• Cain struck Kyogre with Judgment Radiance: Triple Strike and a massive slash, shattering its barrier despite being blasted into the clouds by Kyogre.
• Erza, Wendy, and Lucy attacked Kyogre with their strongest magic, while Lucy exhausted her magic power casting Star Map Chronicle.
• Kyogre emerged from the explosions with vitality in its golden eyes, and Cain and the others realized they had awakened it.

Cain and his companions awakened Kyogre, who thanked them by granting them the Light of the Ocean and a summoning key for Lucy. After Kyogre departed to repair the damaged seas, the group returned to the Deep-Sea Realm and reported the commission complete to Kuba.

• Kyogre awakened and explained that the bronze bell was an ordinary bell used to wake it.
• Kyogre gave the group the Light of the Ocean, strengthening them and their abilities, and gave Lucy a key that could summon a one-attack projection of Kyogre.
• Cain absorbed a vast amount of deep-sea magic power, and Kyogre said Cain's unusual condition required the extra energy.
• Cain asked Kyogre about Groudon, but Kyogre had never heard the name before leaving to repair the damaged sea regions.
• Cain and his companions returned the bronze bell to Kuba, who confirmed Kyogre had awakened and insisted they stay the night.

Cain and his companions celebrated with the Deep-Sea People, where Kuba told them Golden Island would rise to the surface in a month or two. After agreeing to visit, Cain and Erza were assigned the same room and settled in for the night.

• Erza linked arms with Cain to deter the Deep-Sea girls from inviting him to dance, while Kuba explained that the Deep-Sea King's power let people breathe and light fires underwater.
• A golden ribbon of light appeared, and Kuba said it signaled Golden Island's approach; Cain and Lucy recognized its name from Annis's Travelogue.
• Kuba explained that Golden Island surfaced every hundred years, had golden-looking rocks and trees but no gold or living creatures, and was not part of the Deep-Sea Realm.
• Cain, Erza, and the others agreed to visit Golden Island when it surfaced in a month or two.
• After the celebration, Kuba assigned Cain and Erza the same room; Erza hurried to wash up, while Cain calmed himself and thought about holding a wedding for her and the others.

Cain and Erza spent an awkward, intimate night together before the group departed the Deep-Sea Realm and returned to Magnolia with the Deep-Sea Crystal. Back at the guild, Lucy excitedly recounted their adventure, while Cain listened to her embellish the story.

• Cain kissed Erza, washed up, dried her hair, and fell asleep holding her, though he woke during the night and could not get back to sleep.
• The next morning, Cain and the others left the Deep-Sea Realm, and Erza took over piloting when she saw how tired he was.
• The group reached Hargeon, visited Kagura at Mermaid Heel, and then continued on to Magnolia.
• Lucy, Wendy, and the others returned to the guild, where Lucy told Mira they had found the Deep-Sea Crystal and showed off the key to Kyogre.
• Lucy recounted the expedition to the astonished guild members, while Cain watched her turn their journey into a dramatic adventure tale.

Lucy demonstrated the Deep-Sea King projection she had gained on her trip, surprising Fairy Tail with its power. Cain and Wendy then built a Dragon-Seeking Radar to locate surviving dragons, but its first tests left its signal overlapping with their own location.

• Cana persuaded Lucy to summon a projection of the Deep-Sea King, and Cain blocked its attack with his Light Shield before it shattered.
• Lucy told Cain she planned to visit her parents and show them how much stronger she had become.
• Cain told Wendy he wanted to use dragon-bone material to build a radar that could locate dragons, partly to help make protective gear for Erza and Mira.
• Cain and Wendy spent a week building the Dragon-Seeking Radar, but its first test showed the target directly overlapping with Cain's position.
• Cain adjusted the radar and tested it again, but the same result appeared, so he sent Wendy to rest while he investigated the problem.

Cain confirmed that the Dragon-Seeking Radar detected Wendy because it mistook Dragon Slayers for dragons, then revealed his plans to search for surviving dragons. At the Fairy Tail guild, he learned that Makarov had heard of Golden Island but knew no details about it.

• Cain confirmed that the Dragon-Seeking Radar worked but could mistake Wendy for a dragon, then rested after finishing it.
• Cain joined Mira, Lisanna, Elfman, Erza, Wendy, Charle, and Lucy for breakfast and explained that he wanted to find dragons to forge a weapon for Erza and let Mira attempt Take Over after they grew stronger.
• Cain and the others visited the Fairy Tail guild to relax after returning from the Deep-Sea Realm.
• Cain asked Makarov about Golden Island, but Makarov said he had heard of it without ever seeing it.

Cain set out with Erza, Wendy, Charle, and Lucy to search for dragons, then visited Lucy’s family before pursuing reports of strange magic in Water Hemlock Valley. The group left for the valley to investigate, though the Dragon-Seeking Radar had revealed no nearby dragons.

• Mira secretly slept in Cain’s arms before his departure, but her period kept their encounter from going further; she later told Lisanna what had happened.
• Cain’s group began their journey, and Cain explained that they would travel without a fixed destination and treat the search as a sightseeing trip.
• Lucy suggested visiting her home, where Jude and Layla warmly welcomed the group.
• After spending two days at Heartfilia Manor, Cain and his companions learned from Jude about strange magical power sensed in Water Hemlock Valley.
• The group decided to travel to Water Hemlock Valley and investigate the mysterious magic.

Cain and his companions investigated the unnaturally fresh air in Water Hemlock Valley and found a dangerous, magic-filled stone face hidden in a cave. Cain set timed detonation arrays to destroy it, and the group fled before the explosion.

• Cain noticed that the air in Water Hemlock Valley was unusually fresh despite the lack of vegetation, and Wendy figured out the cause.
• Cain led Lucy, Erza, Wendy, and Charle to a cave that he suspected was the source of the strange air.
• Deep in the cave, the group found a man-made stone face containing immense magic power.
• Cain decided to destroy the dangerous stone face and placed timed detonation arrays around it.
• Cain boosted everyone’s speed, and Erza carried Lucy away while Cain, Wendy, and Charle escaped by their own means.

Cain and his companions destroyed the Human-Faced Colossus and discovered that its blast had erased magic particles from the surrounding area. They set off for Golden Island aboard a pirate ship Wendy had commandeered, while Gran Doma worried that FACE might have been discovered.

• Cain noticed that the Human-Faced Colossus's explosion had left a vacuum devoid of magic power, and Erza confirmed it.
• Cain chose Golden Island as their next destination, and the group agreed to go.
• At the Magic Council, Gran Doma heard of a massive energy fluctuation in Water Hemlock Valley and wondered whether FACE had been discovered.
• Wendy and Charle flew off to find transport while Cain, Erza, and Lucy rested by the seaside.
• Wendy returned with a pirate ship, whose crew greeted her as their boss, and Cain's group prepared to depart for Golden Island.

Cain and his companions reached Golden Island, where the Dragon-Seeking Radar detected a dragon. They met Augustus, the island’s golden dragon, who explained that he had appeared because they met his requirements.

• Cain and his companions sailed into the Phipps Sea, and Wendy’s Dragon-Seeking Radar detected a new symbol near the golden pillar of light.
• Cain rewarded the captain with potions, then took his companions to Golden Island and parted ways with the ship’s crew.
• Cain and the others landed on the island and suddenly found themselves facing a gigantic golden dragon.
• The dragon shrank to their size, introduced himself as Augustus, and told Wendy he did not know Grandeeney but encouraged her not to lose hope.
• Augustus explained that ordinary visitors could not see the island because he had not appeared to them, then said Cain and his companions met his requirements.

Augustus chose Cain and his companions to inherit his power, sending them toward the palace through a trial-filled golden forest. The group defeated a Golden Treant and continued toward the palace.

• Augustus told Cain that he had chosen him and his companions to receive his power, then instructed them to walk to the palace.
• Augustus wondered about Wendy’s half-dragon, half-human nature before closing his eyes in the palace.
• Golden vines, arrow-like leaves, and tree-shaped fists attacked Cain’s group as they crossed the forest, but Cain and Erza protected them.
• A Golden Treant appeared and fought Cain, who judged its strength before letting Lucy and Wendy take over.
• Lucy summoned Taurus and Sagittarius while Wendy strengthened them, and their combined attacks destroyed the Golden Treant.

Cain and his companions crossed the Infinite Corridor by following its rule to keep walking until they returned to the starting point for the ninth time. After escaping, they rested on Golden Island and shared a meal beneath the stars.

• Cain led Lucy, Wendy, Erza, and Charle along the golden path, but after an hour they realized they were circling the same place.
• Erza marked a rock with the Fairy Tail guild emblem, and the group later found the mark again, confirming the loop.
• Charle tried to fly above the path but struck an invisible barrier, so Cain decided they should keep walking.
• Erza recalled Augustus’s instruction to keep moving, and Cain pulled Lucy forward when she nearly stopped.
• After the group passed the starting point for the ninth time, the corridor shattered and they learned its rule: they had to keep walking without stopping.
• Cain and his companions rested on Golden Island, where they prepared grilled food and enjoyed the night together.

Cain and his companions crossed Profound Lake, enduring its extreme pain as it strengthened their bodies, and reached the golden palace. Inside, Augustus welcomed them and said they had passed his trial.

• Cain took the night watch while Erza joined him by the campfire after the others fell asleep.
• The group reached a black lake before the golden palace, and Cain discovered that its energy strengthened the body while causing intense pain.
• Cain, Erza, Lucy, Wendy, and Charle pushed through the lake together, using Cain's determination to keep going.
• Cain and Erza reached the palace first, and Cain caught Lucy and Wendy while Erza caught Charle as they collapsed on the steps.
• Augustus explained that Profound Lake only worked once, and Cain's group entered the palace, where Augustus praised them for passing his trial.