Hiromichi Oohashi wrote in to let us know about his new synth book featuring rare and somewhat strange synthesizers from Japan. The book features synths from his collection along with a CD of audio/music. You can find the book via the publisher Rittor Music (Japan) (published Nov.2021), and on Amazon JP here.
You can find a list of the synths featured by chapter further below.
Details on the book from Hiromichi Oohashi follow.
"This art book introduces many of Japanese most rare and strange electronic musical instruments (1960s~1980s) from author's private collection for long years.
Contains over 130 synthesizers, rhythm machines, organs, toy instruments, speech synths, etc most of these rare instruments will be the first public release. All color pages, lot of beautiful photo of these unique instruments with simple and detailed text, all photos and book design by author himself.
Contribution from Mark Mothersbaugh (DEVO)
Foreword by Eric Schneider (author of TOY INSTRUMENTS/MBP)
Attached CD has original music using these strange instruments so you can hear what these synth sounds like.
CD's music made by author's band KINO-MODERNO (world-renowned electronic music duo)

Hiromichi Oohashi is an artist born in Tokyo 1961
after studied art & design at Kuwazawa Design School in Tokyo
works as an artist and producer for Art, Design and Music
also known as collector of rare electronic musical instruments
in 1990 released groundbreaking [ VIDEO DRUG2/Phuture ] and get noticed
member of electronic music duo KINO-MODERNO since 1984
president of DAT PLANET PRODUKT"