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Song Information

Artist: U1 overground
Composition/Arrangement: U1 overground
BPM: 150
Length: 2:08
Movie: Hiromitsu Kawasaki
First Music Game Appearance: beatmania IIDX 23 copula
Other Music Game Appearances: None.



Song Connections / Remixes

  • セロトニン is part of U1 overground's series of songs named after a neurotransmitter.


  • Serotonin is a monoamine neurotransmitter popularly thought to be a contributor to feelings of well-being and happiness.
  • "Orbitalictro" is a portmanteau of "orbitalic" and "electro".
  • セロトニン marks Yuichi Asami's first use of his U1 overground alias in the beatmania IIDX series.
  • On the iTunes release of the beatmania IIDX 23 copula ORIGINAL SOUNDTRACK album, セロトニン's title was romanized.
  • セロトニン's title uses a different font for the song title since beatmania IIDX 24 SINOBUZ.
  • セロトニン is available in beatmania IIDX INFINITAS as part of beatmania IIDX INFINITAS Music Pack vol.10 (beatmania IIDX INFINITAS 楽曲パック vol.10).
  • セロトニン is currently the only song of U1 overground's series of songs named after a neurotransmitter that has not appeared in the DanceDanceRevolution series.

Song Production Information

U1 overground

What is "happiness"?

Video Production Information

Hiromitsu Kawasaki

I participated in this game again, continuing from the previous one.

Inspired by the title, I wanted to make an intellectual video using chemical structural formulas.
I'm a humanities person, so I researched how to write chemical structural formulas and the like.
I had a hard time producing this video.
I was afraid that if I made even the slightest mistake in a structure, it would result in a dangerous thing...
I felt strangely nervous (shame).

In high school, we had chemistry as a subject.
I wish I had studied it seriously...
Everyone who is currently a student, let's study hard!
You never know when you'll need the knowledge! Really (cries)

Difficulty & Notecounts

beatmania IIDX difficulty rated from 1 to 12. (Ratings and notecounts obtained from BEMANIWiki 2nd and TexTage.)

Game SP Difficulty DP Difficulty
Notecounts / Charge Notes / Backspin Scratches - 677 / 13 / 0 947 / 11 / 1 1194 / 15 / 2 - 676 / 16 / 0 948 / 14 / 2 1231 / 14 / 2 -
beatmania IIDX 23 copula→Present - 6 9 11 - 6 9 11 -
beatmania IIDX ULTIMATE MOBILE - 6 9 11 - - - - -
beatmania IIDX INFINITAS - 6 9 11 - 6 9 11 -
U1 overground's neurotransmitter series of songs
アドレナリン - ドーパミン - エンドルフィン - セロトニン - ノルエピネフリン