Luffy, who was close to this building, looked left and right, and even used his domineering aura to perceive - "It's so strange, where is the entrance? There's not even a handle or a keyhole on this door!"

"It's more like a stone wall than a door to keep intruders in. There are cliffs on three sides beyond the front of the building, so you can't see that there will be an entrance."

Nami analyzed seriously.

"Grandpa Long, when you see this building, do you remember something?"

Without considering the destruction and forcible break-into of this building, the only thing the group could rely on was the memory of Grandpa Long. However, Grandpa Long just stared straight at the building, and then took a soft breath.

"Huh? What? Do you remember something, Grandpa Long?"

Ahh——!h

It wasn't that he remembered anything - the old thousand-year-old dragon suddenly sneezed loudly for no apparent reason. Ablis was blown away by the air current, and fell to the ground.

"Sneezed! Looks like you remember!"

Chopper said loudly.

But Grandpa Long didn't say anything, and fell asleep on the top of the truck again.

And at this moment, Abisi, who got up from the ground, suddenly felt a vibration from below.

"Earth, earthquake!?"

As soon as Abyss's words fell, there was a noise under everyone's feet, and the ground began to collapse in an instant, and the stone steps around him also collapsed in turn.

Thundered......

"Wow, ahhhhh

Luffy and the others connected the truck, and also fell into the cave hidden underground with the collapse.

The dust rose high, and Ablis clung to her head in fear - fortunately, Nami took out the weather rod in time, and used the wind shell device in it to create a wind cushion under everyone.

Everyone landed smoothly, and their eyes brightened.

"We! It's alive!"

Chopper said with a shudder.

"Ah! It was so sudden! Why did it suddenly start collapsing?"

"It seems to be because of Grandpa Long's sneezing."

Luffy and Nami's voices also came, and Ablis finally opened her eyes. Grandpa Long, who was riding in the van, followed everyone all the way to the bottom of the cave, not understanding what was happening, and lay there in a daze.

"Anyway, it looks like you're in the building."

Sanji removed the roots that were pressing on his body and stood up.

"Haha! Correct!"

Luffy gave a thumbs up, and Sanji shrugged helplessly.

"But what the hell is this place, it doesn't seem like an ordinary cave!"

Frankie patted the dust off his body and stood up.

In the huge underground cavern, there is only a surging light from the patio, but the light is dim. In front of Abyss, there was a huge stone wall. It's a part of the building, and it seems to have fallen with the collapse.

What's going on...... Dragon?

Just like the stone gate just now, there is also a brightly colored dragon painted on the stone wall.

Ablis looked up, "Is this the ......?"

On the vaulted patio of the cathedral-like building, it is decorated with patio paintings. From time to time, you can see some places falling off, but unlike the paintings on the stone walls, these paintings look as if they have just been painted with paint.

"I guess it's because there's no corrosion from the outside air!" Nami looked at it carefully.

"That's amazing! It's a big painting!"

Luffy was babbling as usual, headless and brainless.

"But what the hell is this? And, what exactly is this place? Isn't this the Dragon's Lair?"

Contrary to Luffy, who was excited, Sanji crossed his arms with a puzzled face, "I don't know why, I felt a religious emotion."

In the center of the painting is a sun, moon and stars with the rest of the spheres in circumference

Orbiting, the celestial image circles around it like a wheel. On one of the spheres are the sea and the land, that is to say, the place where humans live.

"I'm on the same page as Sanji."

"yes! Nami!"

"Deliberately building such a structure on the top of a hill and sealing the entrance with a stone gate, it can be seen that this is a temple or something, in short, it is a very sacred place for the inhabitants of the island."

"Grandpa Long said it didn't remember such a building."

"I still can't help at all!"

"What are these words? Did you help Luffy again?"

"I'm the captain! Of course, I don't have to help!"

Luffy said something very pirate captain-like, but was immediately distracted by a part of the patio painting: "Look, there are a lot of sparrows flying on it!"

"Luffy, that's a dragon!"

Chopper corrected.

"Wait...... It should be an island, that, isn't that the island?"

As soon as Nami said it, everyone could see that it was the current island.

"Really! It's a lot like this building!"

Ablis saw a white building on the top of the green hill on the right. Around the building, there are many people who are worshipping the shrine devoutly.

"In this case, the people depicted around the building should be the people who used to live on the island, and they are looking in the same direction, and they are paying homage."

Move your gaze to the left of the crowd of worshippers.

"Dragon! There are a lot of dragons ......!"

Here, a group of thousand-year-old dragons who were mistaken for sparrows by Luffy just now are drawn, and the stone wall that fell next to Abis just now should have fallen from there.

"In other words...... The inhabitants of this island once believed that the millennium dragon was a sacred creature and worshipped them. Therefore, many statues of dragons were built, and such a shrine was also built to worship the thousand-year-old dragon."

"If we follow this line of thought, and the patio painting is painted with a map from a long time ago, then the dragon's nest where the thousand-year-old dragons gather should be in the direction that people are facing when they worship, but the shape of the island where the dragons are located ......."

"Wait! What's that?"

Hearing what Nami said, Frankie screamed.

In the direction of the worshippers, the millennium dragon gathers there. The mountain, which is shaped like a dragon, is like a sailboat sailing in the middle of the sea.

"Gunkanjima?!"

"It's really Gunkanjima! If you look at the map and look at it, the Dragon's Lair should be near Abyss's hometown!"

"Wait a minute!"

Zoro interjected, "If the Dragon's Lair is near Gunkanjima, then why does Grandpa Dragon say he wants to return home?"

"I mean, if it's as the patio instructs."

"Yes! You simple-minded green algae, listen to Nami!" Sanji ruthlessly entrained the private goods.

"Hey, roll your eyebrows, who do you say ......?"

"Hey, let's look at that painting again, don't you think there's something wrong if you look closely?"

This time it was Ablis who discovered the problem.

"What's wrong? Abyss."

"Look! This island stretches all the way to the vicinity of Gunkanjima, isn't it?"

"Really, really!"

The circular patio is very high, and the light is dim, so it looks like a struggle. Still, it can be seen that there is an island as large as a continent in the patio painting. The island with its white buildings is not actually an island, but a mountain.

"Judging by the buildings and roads that sank into the sea when the ship was stopped, it is clear that this island sank for some reason a long time ago. It must have been a very large island before...... maybe

Maybe it's as big as Alabastan!"

Nami has entered the state of "detective reasoning" -

"The coastline of this large island once stretched to the vicinity of the small Gunkanjima, so the place where the millennial dragons lived should be in the strait between the large island and the small island!"

"In other words, it is impossible to find the dragon's nest on this island now!"

"Nami?"

"Judging from that map, the Dragon's Lair should be heading west from here, in the sea near Gunkanjima!"

"Blah, blah, blah!"

Luffy, who had never been good at such complex thinking, widened his eyes, he was already completely confused, "I still don't understand, in this case, Gunkanjima is the Lost Island? Is the legend that Grandpa Poku said fake?"

"It's not fake. Battleship Island and this island are both lost islands."

"Why?"

"Didn't Grandpa Poku say that the Lost Island sank into the sea when it was very prosperous. The descendants of the royal family on the island moved to Gunkan Island and continued their lives. It's not uncommon for old legends to be passed down by word of mouth and have some slight discrepancies between facts, such as Crown Island, which we visited before, and the picture on this patio makes the facts clear."

"In other words, both this island and Gunkanjima were named Lost Island, right?"

"That's right! Sanji. This is a part of the sunken continent known as the Lost Island! Both this and Gunkanjima used to be high mountains on this continent, but now only the summit part remains as an island!"

"Grandpa Dragon!"

Abyss looked at Grandpa Long's face.

"The Dragon's Lair is near Gunkanjima, isn't it? Even if you said it was in the direction of the rising sun!"

At this moment, the glass-colored birds that Ablis had encountered on the way up the hill flew in through the small hole where the sunlight shone in, and cried loudly in the hall where the pillars of light shone down.

Ablis noticed Grandpa Dragon, who was watching the birds.

Glass-colored birds, glass-colored wings - the same brightly colored wings as the thousand-year-old dragon in the patio painting.

What's going on?

Ablis asked Grandpa Long.

At this time, the birds began to fly around on the patio paintings. From the top of the hill with the white dome temple, fly west until you reach the marked sea, which is Gunkanjima.

"Remembered!"

"Abyss? What's wrong?"

"Grandpa Long said that just like the painting on the patio, on the east side of Gunkanjima, where the sun rises, is the dragon's nest! Once in a thousand years, the millennial dragons will gather here on the sea to meet their king!"

Abyss relayed Grandpa Long's original words directly to everyone.

"I'm really sorry! Bringing everyone here for a place that has sunk into the sea has wasted a lot of time! I'm so sorry!"

"It's okay, it's just a little bit of a walk!"

Sanji said this, and Nami also cooperated and pretended to sigh, "yes! Ever since I got on Luffy's thief ship, it seems like I've been taking a detour all the time!"

"Everyone......?"

"And it's nice to take a detour to get here?"

Zoro said coolly.

"Hey, Zoro, you're just getting lost!"

The Lost King is very mercilessly ridiculed by Frankie - Sanji and the others are also winning.

「...... Thank you so much!"

Ablis's heart was filled with warmth, and she expressed her truest feelings to the best companions who had given her courage and found a way to ease her guilt. At this time, Abisi also better understood the mood of Grandpa Long when he said thank you to everyone during the journey.

She looked at Grandpa Long again, who was looking up at the birds flying on the patio.

What do those glass-colored birds mean to Grandpa Long?

This? Abyss suddenly understood.

They are friends!

Grandpa Long had seen thousand-year-old dragons flying in the sky, and now, Grandpa Long saw it again! Before you know it, tears gleamed in its old eyes.

…… I want to go home!

"Grandpa Long, I won't give up!" Abyss said loudly, "I've made an appointment with you, and I'll find the Dragon's Lair!"

"That's right, Ablis, that's the momentum! All right! Let's go! Let's go to Gunkanjima!"

Luffy shook his fist.

"There's no need to leave in such a hurry," Nami pulled out the phone bug, "I'll have to take pictures of these things before I go, and General Polusalino might be useful...... These murals are really interesting!"

"Then we'll take advantage of Nami's ......."

The birds suddenly screamed loudly, and swarmed towards the entrance of the cave, interrupting Sanjimoto's proposal to prepare a picnic for everyone in the same place.

"There's a bad guy coming!"

Abyss heard the vigilant voices of the birds, and the domineering appearance of Zoro and the others also sensed undisguised hostility in time.

Whoosh – whoosh!

Frankie's highly modified body was silently cut open.

"Hahahaha, thank you for leading the way! Pirates, thanks to you, we found the Dragon's Lair and this island!"

With such a voice, the figures of two men appeared at the entrance of the patio.