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Not to be confused with Lesson 5 for your hips.


Song Information

Artist: Risk Junk feat.Erika Mochizuki
Composition/Arrangement: Takayuki Ishikawa
Lyrics: iqua
Vocals: Erika Mochizuki
BPM: 152
Length: 2:04
VJ: 東京食堂
First Music Game Appearance: beatmania IIDX 12 HAPPY SKY
Other Music Game Appearances: None.


sunny day without a cloud in the sky.
my favorite number start playing on the radio.
here comes a special wave, come on, let's go for it!

there are many happy things that we can get.
you know, can't make a living off reality.
you may fail, but you'll bounce back,
one hit could turn the game around,

your smile has power of love.
so talk loud, alot and smile you may do.
always you don't worry,
yes! happiness is something you feel.

if it rains you don't need your umbrella.
let's share my blue one together.
and let's think of what we are going
to have for special sweets with me.
It can feel so good,
we can do cry and laugh each other.
look! what a beautiful sunset!
yes, happiness is something you feel.

Song Connections/Remixes



  • LESSON 5 marks the second appearance of the digital stick man in a video.
  • LESSON 5 is one of the beatmania IIDX 12 HAPPY SKY preview songs in beatmania IIDX 10th style CS. To unlock it, you must complete any combination of either ARCADE MODE, DAN MODE, or EXPERT MODE five times in a row without failing.
  • LESSON 5 is unlockable in beatmania IIDX INFINITAS from April 4th, 2018, after purchasing its NORMAL, HYPER, and ANOTHER charts with BITs.

Song Production Information

Risk Junk

The sky is only as clear as the happiness you can feel... Expressing this in a song was a bit difficult!

Video Production Information


Difficulty & Notecounts

beatmania IIDX difficulty rated from 1 to 8 in 10th style, and from 1 to 12 from HAPPY SKY onwards. (Ratings and notecounts obtained from BEMANIWiki 2nd.)

Game SP Difficulty DP Difficulty
Notecounts 252 654 949 1261 - 549 939 1471 -
beatmania IIDX 12 HAPPY SKY - 5 8 10 - 5 7 12 -
beatmania IIDX 13 DistorteD→Present - 5 8 ↓9 - 5 7 ↓11 -
beatmania IIDX 10th style CS - 5 7 7 - 4 7 7 -
beatmania IIDX 12 HAPPY SKY CS 2 5 8 9 - 5 7 11 -
beatmania IIDX INFINITAS - 5 8 9 - 5 7 11 -
beatmania IIDX ULTIMATE MOBILE - 5 8 9 - - - - -