Purchase from DLsite here: https://www.dlsite.com/maniax/work/=/product_id/RJ281443.html
Raw: /g/2198428/b8827e7d1a/

This work is a set of background material books that accompanied some Boob themed idol songs.

I highly recommend purchasing this work! You can listen along to the songs translated here, and use the extra translations provided to enjoy the charming character commentary the accompanies the guidebook and character introductions (translations for character introductions still to come).
The work also includes versions of the songs for each character, and alternate versions done while performing fellatio and handjobs!

Did you know the grown-up teacher stammers whenever she says "dick"? Or that Hajime uses "boku"? Getting the full version from DLsite is my highly recommended way of getting the full experience and seeing all the little charm points put into this very detailed work!

Page 4-116: A guidebook the character's bodies
Page 118-122: Song lyrics
Page 127-180: Character profiles

There are also three song covers linked to in the character profiles.
Asuka sings the Usagi Drop OP: https://www.youtube.com/watch?v=JjH9ig6jgtg
Mikoto sings the My Little Monster OP: https://www.youtube.com/watch?v=yTt_2d59iCA
Himawari sings Renai Circulation: https://www.youtube.com/watch?v=hul7VZpkWc8 (which is a good cover, though she kind of moves in and out of her character's voice and her real voice)

new knowledge acquired

Base +6, RapidBlast +5, Zero225 +17, seba19 +6, kurodaerk +6, avrelivs +6, earlofstasis +9, Alphasekai +6, Cybershadowninja2 +11, atarau +6, Quflow +7, slav3r +6, Leonidas23 +11, and 2 more...

This works is like the masterpiece of this circle haha, not only 3 song with lewd lyrics and all the varions, those interview from the picture on this galleries? All voiced! They also add family tree to each idols, and even some fake song debut on youtube.

Base +10, earlofstasis +9, Alphasekai +6, Zero225 +17, Shiro_ Ecchi +11, WVKEPnHvONrLPvFJPWyv +4

god the vagina comparison is such a weird take coz in the end they have to censor it with mosaic

Base +7, earlofstasis +9, applemania +6, Cmdrtimbt +6

Porn music lmao, didn't expect that.

Base +6, earlofstasis +9, WVKEPnHvONrLPvFJPWyv +4

Knowledge hentai like this is always good.

Base +4, earlofstasis +10, bramsatyo123 +3

I didn't knew you can masturbate while hearing "music", the fck I'm doing here. (╯°□°）╯︵ ┻━┻

Base +6, earlofstasis +10, Zero225 +17, WVKEPnHvONrLPvFJPWyv +4

Japan really desperate for new baby huh.

Base +7, earlofstasis +10, WVKEPnHvONrLPvFJPWyv +4

heavy rotation with crazy lyric

Base +6, earlofstasis +10