チルノのパーフェクトさんすう教室 (PV) (Cirno's Perfect Math Class)
Romanized: Chiruno no Paafekuto Sansuu Kyoushitsu (PV) (Cirno's Perfect Math Class)
IOSYS (group)
ARM (arranger), 夕野ヨシミ (lyrics), miko (vocals)

The notes during the "Baka, baka!" parts are supposed to mimic Cirno's "Icicle Fall" spellcard. Not sure if it succeeded.

Difficulties:
Extreme - 9
Hard - 7
Normal - 4.5

Charter: JoldNoteC

Sources:
Video: https://www.youtube.com/watch?v=V_bQNPG2OyE
Cover: https://en.touhouwiki.net/wiki/File:IO-0147.jpg
Background: video thumbnail
Translations/other information: https://en.touhouwiki.net/wiki/Lyrics:_%E3%83%81%E3%83%AB%E3%83%8E%E3%81%AE%E3%83%91%E3%83%BC%E3%83%95%E3%82%A7%E3%82%AF%E3%83%88%E3%81%95%E3%82%93%E3%81%99%E3%81%86%E6%95%99%E5%AE%A4