Ryoushi no umi no Lindwurm

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Song Information

量子の海のリントヴルム's jacket.
量子の海のリントヴルム's pop'n music banner.

Artist: 黒猫ダンジョン
Composition/Arrangement: Kuroneko Dungeon
BPM: 280
Length: 1:53
Genre: EPIC PROG (エピックプログレ)
pop'n music Character: Maud [SP]
pop'n CG designer: いそにん
Movie: いそにん
Jacket design: いそにん
First Music Game Appearance: jubeat copious
Other Music Game Appearances:



Song Connections / Remixes


  • 量子の海のリントヴルム is one of the hidden songs in jubeat copious. It could be unlocked by getting a FULL COMBO on a Level 10 song with 3 other people at the same time either offline or online.
    • In jubeat saucer, it can be unlocked via the bistro saucer unlocking event.
    • In jubeat saucer fulfill, it can be unlocked as part of saucer macchiato's Side Menu from April 23rd, 2014.
    • In jubeat prop, it can be unlocked by playing it as a BONUS TUNE from May 28th, 2015.
    • As of jubeat Qubell, it is available by default by playing with an e-amusement pass.
  • "Ryoushi no umi no Lindwurm" (量子の海のリントヴルム) translates to "quantum sea Lindwurm".
    • A Lindwurm (or lindworm) is, according to Brit heraldry, a term for a wingless bipedal dragon, often with a venomous bite. In Norway heraldry, though, it can also refer to sea serpents.
  • 量子の海のリントヴルム's jubeat charts were created by まっする.
  • 量子の海のリントヴルム could be unlocked in REFLEC BEAT limelight by reaching the first part of jubeat Glass Stage 3.
  • After being re-rated in REFLEC BEAT colette -Spring-, 量子の海のリントヴルム is the first REFLEC BEAT song with its MEDIUM chart rated Level 9.
    • It is the only song in REFLEC BEAT with a MEDIUM chart rated Level 9 where none of its charts are rated Level 12.
  • In jukebeat, 量子の海のリントヴルム's title and artist are changed to LINDWURM and Black Cat Labyrinth respectively.
  • 量子の海のリントヴルム is one of the songs part of the Mimi, Nyami & Kotaro no flying catch! (ミミニャミ・コタローのフライングキャッチ!) event. It could be unlocked in pop'n music Sunny Park since June 3rd, 2013.
    • From September 12th, 2014, it could be unlocked in pop'n music ラピストリア via Story Mode.
    • In pop'n music éclale, it could be purchased from the Star Factory shop for 60 lumina.
      • It was automatically unlocked for new players from January 28th to March 1st, 2016, as part of the Limited time welcome pack (期間限定・ウェルカムパック) campaign.
      • It was later available as a default song for new players from April 27th, 2016 to May 16th, 2016 as part of the Golden Welcome Campaign (Golden Welcome キャンペーン).
    • As of pop'n music うさぎと猫と少年の夢, it is available by default.
  • 量子の海のリントヴルム's character in pop'n music, Maud, is based on the girl that appears on the jacket of the song.
  • 量子の海のリントヴルム is a song part of the POLICY BREAK event. For more information on the dates it could be unlocked in the SOUND VOLTEX series, please see the event page.
    • From November 15th, 2018 in SOUND VOLTEX IV HEAVENLY HAVEN, it can be purchased with BLOCKs instead.
  • 量子の海のリントヴルム is one of the Phase 1 unlockable songs of the Kaitsuu! Tokotoko line (開通!とことこライン) event of beatmania IIDX 23 copula. It could be unlocked from November 26th, 2015.
  • In beatmania IIDX, 量子の海のリントヴルム's genre is kept in Japanese.
  • When 量子の海のリントヴルム is played in beatmania IIDX, the arcade LED ticker displays "MAUD AND HER WATER DRAGON".
  • 量子の海のリントヴルム was added to BeatStream アニムトライヴ on January 14th, 2016, as part of the Takahashi-san no otoshidama campaign! (タカハシサンのお年玉キャンペーン!) event.
  • 量子の海のリントヴルム received a NIGHTMARE chart in BeatStream アニムトライヴ on January 11th, 2017, unlockable via BEAST HACKER.
  • After being removed from the initial release of REFLEC BEAT 悠久のリフレシア, 量子の海のリントヴルム was revived on February 2nd, 2017.
    • Its WHITE HARD chart could be unlocked through a quest in Reflesia Mode (リフレシアモード) from February 23rd to March 8th, 2017.
      • As of January 25th, 2018, it is available by default.
  • 量子の海のリントヴルム's title uses a different font for the song title since beatmania IIDX 24 SINOBUZ.
  • 量子の海のリントヴルム could be unlocked in SOUND VOLTEX III GRAVITY WARS コナステ's INFINITE course from April 8th, 2020 through April 30th, 2020 by playing INFINITE at least once during that time frame.
  • 量子の海のリントヴルム is available in beatmania IIDX INFINITAS as part of beatmania IIDX INFINITAS Music Pack vol.11 (beatmania IIDX INFINITAS 楽曲パック vol.11).
  • 量子の海のリントヴルム is part of the Maishuu! Ichika no chou BEMANI rush 2020 (毎週!いちかの超BEMANIラッシュ2020) event. It could be unlocked in ノスタルジア Op.3 from August 19th, 2020 until October 29th, 2020.
    • It can be unlocked through the limited time episode Toki wo meguru ongaku-sai Vol.IV (時を巡る音楽祭 Vol.IV) from July 14th to September 22nd, 2022, from August 24th to September 28th, 2023, and from May 23rd, 2024 onwards.
  • 量子の海のリントヴルム is available in コナステ ノスタルジア as part of Konasute NOSTALGIA Music Pack vol.2 (コナステ ノスタルジア 楽曲パック vol.2).
  • 量子の海のリントヴルム appears as one of the background music selectable to play during fever rush in SMASHSTADIUM (スマッシュスタジアム), a KONAMI medal redemption game.
  • After the removal of the jubeat plus copious pack 06, 量子の海のリントヴルム was not available again until the release of jubeat (2021).
  • 量子の海のリントヴルム's jubeat (2021) ratings were adjusted to its jubeat festo ratings on March 7th, 2022.
  • 量子の海のリントヴルム is available in DanceDanceRevolution GRAND PRIX's GRAND PRIX mode from June 24th, 2022, by purchasing SPECIAL music pack feat.jubeat vol.2 (スペシャル楽曲パック feat.jubeat vol.2).
    • Its CHALLENGE charts become available by purchasing both this and SPECIAL music pack feat.jubeat vol.1 (スペシャル楽曲パック feat.jubeat vol.1).
    • By purchasing both packs with an active subscription, 量子の海のリントヴルム and its CHALLENGE charts could be played in DanceDanceRevolution A3.
    • From June 30th, 2023 in DanceDanceRevolution A3, it is available by default for all players.
  • Prior to DanceDanceRevolution WORLD, 量子の海のリントヴルム's music video is shown full screen, eliminating any on-screen dancers.

Music Comment

The story of the dragon and the girl begins here... watch out for the dynamic keyboard performance and the progressive development!

Song Production Information

beatmania IIDX

Kuroneko Dungeon

That girl--

That blue-haired girl... she was alone gathering fragments in this collapsed world

She seems to be collecting the fragments in one place

There appears to be a silhouette deep inside that place

... Is it some kind of ritual--?

"Please... don't come here again..."

That's what the girl, who was connected to the giant dragon, Lindwurm, quietly said.

Alone in the floating quantum sea, where the universe collapses into fragments of infinite possibilities

There's no doubt this girl standing with the dragon holds the key to the collapsed world...


So, Ryoushi no umi's story returns with a movie by the great master isonin, meow!

You're probably at the mercy of this very mysterious movie. Meow!

Maud, Lilieze, the hero. What'll happen to these 3 people in the future?

Sorry for being late, meow, my name is Kuroneko Dungeon.

When you say it in French, it's Chat Noir Donjon, meow.




Video Production Information


Recently, I've been addicted to fried rice.

There's a Chinese restaurant in a slightly luxurious 8-floor building, but anyways, it's so delicious that when I was eating, it feels like a force blowing me away, as if time had stopped.

Today, I'm looking at the wide cityscape below me, while filling my mouth with fried rice.

"The first time I heard KuroDun's announcement was at a Chinese restaurant..."
I was lost in thought.

That time, the shop was in a small neighborhood that looks nothing like here.

"Ryoushi no umi no Lindwurm"

Kuroneko Dungeon's first song.
A few days later, I drew the jacket for this song.

It's been a year since then... time flies by so fast.

The city is peaceful and the fried rice is delicious.
I'm also eating fried rice like this today.
Even though I'm chased by busy days, I feel happy to be able to enjoy the taste of fried rice.

I need to spread the word about this delicious fried rice.
Let's tell the world about how I'm fulfilled by fried rice.

My very natural thoughts flowed well, like a sense of purpose.

Beep, beep, beep.

Just as I took my mobile phone out from my bag, I received a new email. This is rare for me, as someone with few friends.

The quantum sea has returned!


A few minutes later, my phone exploded.
KuroDun successfully used the latest tools in our information-filled current society.

This time, the heroic story is that I used up all my stylus refills?
I like using the felt-type core, but it immediately wears out and breaks.

Previously, I gave the pen part of the stylus (=the crucial part) to T_da, who lost it, but

"isonin's pen tip is fluffy! It's fluffy!"

I remembered that she said this.

Jacket Design Information


At a certain Chinese restaurant, the team members were eating together.
Shoccho, who sat next to me, stood up like he was suddenly struck by lightning, pointed at me and said

"It's a last boss-like song, meow! isonin, please do it, meow!"

Shoccho stared at the shrimp chili in front of him, as if he was controlled by someone.
It was strange.
Having said this, the conversation ended without incidents.

A few days later, on a certain afternoon, Kuroneko approached my feet while I was working at my desk.

"I made an amazing song, meow! I'll leave the rest to you, meow!"

After KuroDun talked about Lindwurm's world for a while, he started grooming my knees and fell asleep shortly.

I was also captivated by it, and just as I dozed off, my sight suddenly became pitch black and my body felt lighter.

When I squinted, a small, light blue light flickered in front of me.
When I hesitantly approached that light, a small girl with flowing blue hair looked at me and murmured something.
However, her voice was so soft that I couldn't hear what she said, and I was engulfed in light and lost consciousness.

When I suddenly woke up, KuroDun wasn't there, and this jacket was already completed on my computer screen.
How strange is that?
I tilted my head, submitted it to T_da and said "it's done.".

Character Information

A girl who was born with a dragon, and looks towards the end of the world with it.
I wonder what's the story of those eyes.


Well, I guess I'll return home now...

While staying up late, the office floor had few people in it.
I tidied up my work, and prepared to return home.

Zuddon garararadon gororodosa

When I looked up in surprise at the loud noise, TOMOSUKE, who was covered in bruises on the desk, rolled around while clutching his knees.
Even though we're in Kobe, why... is TOMOSUKE... here...?
TOMOSUKE slowly got up, while supporting his body which was about to collapse any moment, and opened his mouth.

"Next time, next time... the 9 buttons... meow!"

It's here.

This is an announcement from KuroDun.
I don't know why KuroDun somehow always controls someone else to commands me.
Why would he do this to TOMOSUKE, who I'm not related to? It doesn't matter.

"Thank you very much!!"

Anyways, the opportunity has finally arrived, I can work in pop'n!
I threw the bag I was holding, yelled in victory, and ran around the floor.
Although I thought I heard TOMOSUKE scream, that wasn't the time now.
I was running around in a daze, that I almost lost track of the time for a while.
And before I knew it, TOMOSUKE was no longer there.

Of course, my first long battle to create animations for Maud and Lindwurm will begin from now.
Just before the deadline, I thought to myself in front of the computer about how difficult making animations was.
Hats off to the pop'n designers.
I thought my right hand was going to explode.

Chart Production Information


The jacket was already made when I created the notecharts, so I made them with the complete image.
I wanted to express a speedy feeling like advancing through a dungeon, running through chaos, and through flames spreading from above and under.

Just by looking at the charts, that scene... does it come to mind?? How is it?

Difficulty & Notecounts

BeatStream difficulty rated from 1 to Kami (神) in アニムトライヴ.
beatmania IIDX difficulty rated from 1 to 12.
DanceDanceRevolution difficulty rated from 1 to 20 from X onwards.
jubeat to clan difficulty rated from 1 to 10, and 1 to 10.9 from festo onwards.
pop'n music difficulty rated from 1 to 50 from Sunny Park onwards.
REFLEC BEAT to groovin'!! Upper difficulty rated from 1 to 10+, 1 to 13 in VOLZZA/VOLZZA 2, and 1 to 15 in 悠久のリフレシア.
SOUND VOLTEX BOOTH to III GRAVITY WARS difficulty rated from 1 to 16, and 1 to 20 from IV HEAVENLY HAVEN onwards.
ノスタルジア difficulty rated from 1 to 12 for Normal to Expert charts. Real charts rated from 1 to 3 diamonds (◆).
ポップンリズミン difficulty rated from 1 to 10. (Ratings and notecounts obtained from BEMANIWiki 2nd, Pop'n Music Fever, jubeat@Wiki, and TexTage.)

beatmania IIDX

Game SP Difficulty DP Difficulty
Notecounts / Charge Notes - 468 / 0 919 / 12 1508 / 22 - 469 / 0 940 / 14 1407 / 32 -
beatmania IIDX 23 copula→Present - 6 9 11 - 6 10 11 -
beatmania IIDX ULTIMATE MOBILE - 6 9 11 - - - - -
beatmania IIDX INFINITAS - 6 9 11 - 6 10 11 -


Game Level
Light Medium Beast Nightmare
Notecounts 159 263 485 809
BeatStream アニムトライヴ 5 9 10 10+


Game Single Double
Beginner Basic Difficult Expert Challenge Basic Difficult Expert Challenge
Notecounts / Freeze Arrows / Shock Arrows 111 / 8 288 / 25 473 / 16 727 / 4 834 / 5 / 0 268 / 23 439 / 17 705 / 4 801 / 1 / 0
DanceDanceRevolution GRAND PRIX 4 10 14 17 18 9 13 17 18
DanceDanceRevolution A3→Present 4 10 14 17 18 9 13 17 18


Game Level
Basic Advanced Extreme
Notecounts 330 536 801
jubeat copious→clan 5 7 10
jubeat festo→Present 5 7 10.5
jubeat plus 5 7 10
jukebeat 5 7 10
jubeat plus (Android) 5 7 10
jubeat (2021) 5 7 10.5

pop'n music

Game Normal Mode Battle Mode
Notecounts 175 390 854 1349 334 534
pop'n music Sunny Park→Present 12 28 41 48 20 29


Old Charts

Game Level
Basic Medium Hard Special
Notecounts 272 493 757 -
REFLEC BEAT limelight→colette -Winter- 5 8 10+ -
REFLEC BEAT colette -Spring-→groovin'!! Upper 5 ↑9 10+ -
REFLEC BEAT plus 5 9 11 -

New Charts

Game Level
Basic Medium Hard White
Notecounts 343 584 862 1005
REFLEC BEAT 悠久のリフレシア 8 11 14 15


Game Level
Max Chain 484 879 1811 - -
Effected By 風瑠人 風瑠人 風瑠人 - -
Jacket Artists いそにん いそにん いそにん - -
SOUND VOLTEX III 6 12 15 - -
SOUND VOLTEX IV→Present 6 12 ↑17 - -
SOUND VOLTEX III コナステ 6 12 17 - -


Game Level
Normal Hard Expert Real
Notecounts 249 594 1030 1485
ノスタルジア Op.3→Present 3 7 11 ◆2
コナステ ノスタルジア 3 7 11 ◆2


Game Difficulties
Normal Hyper EX
Notecounts 120 309 517
ポップンリズミン 3 7 10
jubeat Unlocks サヨナラ・ヘヴン - リメンバーリメンバー - Snowfield Express - 黒髪乱れし修羅となりて - 防人恋歌 - カラルの月
恋はどう?モロ◎波動OK☆方程式!! - Brand New World - neu - 少年は空を辿る
pop'n music Unlocks yellow head joe - Evans - Riot of Color - 量子の海のリントヴルム - HEAVENLY MOON - The Wind of Gold
†渚の小悪魔ラヴリィ~レイディオ† - JOMANDA - PRANA - True Blue
Final Song 終末を追う者
VALLIS-NERIA - I'm so Happy - BabeL ~Next Story~ - 恋はどう?モロ◎波動OK☆方程式!! - Playing With Fire - 8 -eight- - True Blue - Sakura Mirage
INSECTICIDE - 朱と碧のランページ - 打打打打打打打打打打 - 鬼天 - HAVOX - 量子の海のリントヴルム - 灼熱Beach Side Bunny - ΕΛΠΙΣ - ドーパミン
伐折羅-vajra- - Virtual Bit - 爆なな☆てすとロイヤー - アキネイション - 踊るフィーバーロボ - JOMANDA - If - Boss Rush - 恋歌疾風!かるたクイーンいろは
Rebellio - We Go Down - Concertino in Blue - Glitter Flatter Scatter - cobalt - НУМЛ - RHYZING BEAT - Evans - Chrono Diver -PENDULUMs- - ECHIDNA
Sulk - Midnight City Warfare - †渚の小悪魔ラヴリィ~レイディオ† - Yum Yum Sweetie - MODEL FT4 - V - Übertreffen - 蛇神 - Harmonia - ENDYMION
Nebulas - αρχη - 卑弥呼
Phase 1 Blue Spring Express - Central Station - GOBBLE - Rock It - Violet Rose - 量子の海のリントヴルム
炸裂!イェーガー電光チョップ!!(JAEGER FINAL ATTACK) - 夕焼け ~Fading Day~
Phase 2 Arcana - Battle Train -IIDX Edition- - chaos eater -IIDX edition- - Konzert V - On the FM - SWEETEST SAVAGE
Welcome - 真 地獄超特急 -HELL or HELL-
いちかラッシュ Crazy Shuffle - Into The Madness - Our Love
GOLDEN CROSS - memento mori -intro- - Shuffle cats
All Clear!! - BLSTR - 量子の海のリントヴルム
Last Twilight - ORCA - 不可説不可説転
Leviathan - Little Prayer - サヨナラ・ヘヴン
蒼が消えるとき - バッドエンド・シンドローム - 白露の風
ΩVERSOUL - Truare! - 恋歌疾風!かるたクイーンいろは
GHOST KINGDOM - m1dy Deluxe - カゴノトリ
ののラッシュ ERROR CODE - Forgetting Machine - Step forward - ノルエピネフリン - うさぬこぬんぬんファンタジー!
Din Don Dan - Spica - 多極性ニューロンの崩壊による人間の末路
PANIC HOLIC - Sulk - カヨワキコイノウタ
Lisa-RICCIA - Voyager - X-Plan - ぱんだしんけん1、2、3 ~ちえ!おっしょさんにはかなわないや!~ - 防人恋歌
HARD BRAIN - New Decade - RAIN - WHITEOUT - シャムシールの舞
Love 2 Shuffle - Megalara Garuda - 灼熱Beach Side Bunny
いちかの新曲 Sparkle Smilin' (GITADORA EDITION) - 狂水一華 (GITADORA EDITION)
のの新曲 Jetcoaster Windy