Album art.

チルノのパーフェクトさんすう教室 ⑨周年バージョン || Cirno’s Perfect Math Class, ⑨th Anniversary Version

Album art.

チルノのパーフェクトさんすう教室 ⑨周年バージョン
chiruno no paafekuto sansuu kyoushitsu kyuu-shuunen baajon
Cirno’s Perfect Math Class, ⑨th Anniversary Version

Vocals: Members of IOSYS, 幽閉サテライト, A-One, 豚乙女, COOL&CREATE, TaNaBaTa, Alternative ending
[Credited as IOSYS and their merry band of ⑨th anniversary friends (IOSYSと愉快な⑨周年フレンズ)]
Lyrics: 夕野ヨシミ (Yuuno Yoshimi)
Arranged by: ARM
Album: 東方氷雪大感謝 (Touhou Ice and Snow, Deep Gratitude)[Official site]
Circle: IOSYS
Event: Autumn Reitaisai 4 [ARTS4]
Original theme: Tomboyish Girl in Love [おてんば恋娘]

Requested by: xeromic
Watch the official video on YouTube!

Update (October 8, 2017): Added album information and credits from official site. Also, ‘Maths’ was changed to ‘Math’ for consistency with the album art.

Seeing that this famous video has turned 9 makes me feel really old. Where were you 9 years ago? Coincidentally, I was in year 9…

According to the official site, this album was created with thanks and gratitude in mind, presumably aimed at the listeners who have made “Cirno’s Perfect Math Class” so popular over the years. The album’s title is a callback to the original album this song appeared in: 東方氷雪歌集.




ギリギリ 綱渡りで
ドキドキ 一か八かで
単位と卒論 なんとかして卒業
出席日数 ちょっとたりない GO GO!!

バーカバーカ バーカバーカ バーカバーカ
バーカバーカ バーカバーカ バーカバーカ
バーカバーカ バーカバーカ バーカバーカ
バーカバーカ バーカバーカ

紅魔館から 月ロケットが
白玉楼で 二人降りて
八雲さんちが 対抗意識

助けて助けて えーりんえーりん
時間操作で トゥルーエンド

山落ち 意味など無いさ
全ては 心の中

くるくる 宇宙の闇
ぐるぐる 地球回る
そうよ つぶら目玉 ふたつとも狙うの
きゅっとしてきゅっとして どっかんかーん

次々 問題でる
まだまだ 追試続く
凍る 部屋の中

バーカバーカ バーカバーカ バーカバーカ
バーカバーカ バーカバーカ バーカバーカ
バーカバーカ バーカバーカ バーカバーカ
バーカバーカ バーカバーカ


“minna! chiruno no sansuu kyoushitsu, kyuu-shuunen dayo! atai daigaku kyuu-nensei! tensai wo, kiwameta yo!”

“ryuunen janee ka?”

giri giri tsunawatari de
doki doki ichi ka bachi ka de
tan’i to sotsuron nantoka shite sotsugyou
shusseki nissuu chotto tarinai GO GO!!

baaka baaka baaka baaka baaka baaka
“kuchi wo hirakeba baka baka tte urusai wa ne!”
baaka baaka baaka baaka baaka baaka
“soo yuu no wo ‘baka no hitotsu oboe’ tte iu no yo!”
baaka baaka baaka baaka baaka baaka
“nani yo mou! baaka! baaka!”
baaka baaka baaka baaka

koumakan kara tsuki roketto ga
byousoku kyuuman kiro de tobitatta
hakugyokurou de futari orite
han’jin noru hima mo nai
yakumo-san-chi ga taikou ishiki
geigeki-you no misairu buppattaa!

tasukete tasukete eerin eerin
muri muri sakuya ni bun’nage
jikan sousa de turuu endo

yamaochi imi nado nai sa
subete wa kokoro no naka
gensoukyou no chuushin de
“ichi. ni. kyuu!”

kuru kuru uchuu no yami
guru guru chikyuu mawaru
sou yo tsubura medama futatsu to mo nerau no
kyutto shite kyutto shite dokkan kaan

tsugi tsugi mondai deru
mada mada tsuishi tsudzuku
kooru heya no naka
hin’yari shita ondo mo jikan mo ki ni sezu
“yukkuri shite itte ne!”

baaka baaka baaka baaka baaka baaka
“kabadi kabadi kabadi kabadi!”
baaka baaka baaka baaka baaka baaka
“bakadi bakadi bakadi bakadi!”
baaka baaka baaka baaka baaka baaka
“mou minna bakuhatsu shichaeba ii no yo!”
baaka baaka baaka baaka


“Hey everyone! It’s the ⑨th anniversary of Cirno’s Math Class! I’m in my 9th year of university now! I’ve taken my genius to the next level…!”

“Haven’t you just repeated the same class?”

It’s so close! Just like tightrope walking.
Thump-thump! The stakes are high.
Through credit and a thesis, I’ll graduate somehow
But my attendance isn’t quite high enough. Go, go!!

Idiot, idiot! Idiot, idiot! Idiot, idiot!
“You just open your mouths to call me an idiot. How annoying!”
Idiot, idiot! Idiot, idiot! Idiot, idiot!
“They say ‘he that knows little often repeats it,’ you know!” (1)
Idiot, idiot! Idiot, idiot! Idiot, idiot!
“What the hell?! Idiot! Idiot!”
Idiot, idiot! Idiot, idiot!

A moon rocket flew from the Scarlet Devil Mansion
At a speed of 90,000 km/s.
Two people got off at Hakugyokurou.
There was hardly time for half-humans to ride.
That Yakumo lot are so competitive—
They fired off an interceptor missile!

Help me, help me! Eirin, Eirin! (2)
It’s no use! Sakuya, throw something!
Time manipulation causes the true end.

No peak, no climax, no meaning. (3)
Everything lies within one’s heart.
In the heart of Gensokyo…
“1, 2, ⑨!”

Whirling around in the darkness of space,
Round and round, the world turns.
That’s right—I’ll aim at a pair of round eyeballs.
I’ll squeeze them and squeeze them, and then *crash*

The questions come one after another.
There are still more exams!
Inside this frozen room,
Don’t worry about the cold or the time:
“Take it easy!” (4)

Idiot, idiot! Idiot, idiot! Idiot, idiot!
“Kabaddi, kabaddi, kabaddi, kabaddi!” (5)
Idiot, idiot! Idiot, idiot! Idiot, idiot!
“Bakaddi, bakaddi, bakaddi, bakaddi!”
Idiot, idiot! Idiot, idiot! Idiot, idiot!
“I should just go and blow everyone up already!”
Idiot, idiot! Idiot, idiot!

Translator’s notes

(1) By using this proverb, Cirno implies that her tormentors are dumber than her because they say the same thing over and over.

(2) This refers to the CCOL&CREATE song ‘Help me, ERINNNNNN!!’

(3) The Japanese lyrics are a contracted form of 山もない落ちもない意味もない (yama mo nai ochi mo nai imi mo nai). This is where the word ‘yaoi’ stems from (yama, ochi, imi)

(4) This is a reference to the ‘yukkuri’ meme, which involves Touhou characters depicted as giant heads. The phrase can also be translated as “do it slowly.”

(5) Kabaddi is a form of contact sport originating in India. Chanting “kabaddi” is an important part of the game. ‘Bakkadi’ is a corrupted form of the title that also fits in バカ (baka, idiot).


2 responses to “チルノのパーフェクトさんすう教室 ⑨周年バージョン || Cirno’s Perfect Math Class, ⑨th Anniversary Version”

  1. ycdtosa Avatar

    I just wanted to let you know that the arrangement will be appearing on IOSYS’s Autumn Reitaisai 4 album, the website (includes appropriate credits) is here:

    Liked by 1 person

    1. releska Avatar

      Excellent! Thanks for the link. The translation should be updated with the correct information now


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