I didn't express that correctly
You can enquire in English about purchasing through the "For foreigners" function:
https://www.bonsai.co.jp/contact_en/index.php
The product codes to reference in the enquiry are:
- Japanese white pine: S000B41
- Japanese black pine: S000B42
- Shimpaku: S000M01
- Japanese red pine: S000M07
- Ilex serrata and Malus halliana: S000M09
- Japanese maple and Japanes beech: S000M10
- Ume and chojubai: S000M15
- Kaki and kinzu: S000M17
- Trident and zelkova: S000M20
- Japanese camelia and cherry trees: S000M25
- The entire set: H191954
They will normally reply within 2 or 3 business days with a quote including shipping.
The three series are really different.
The Kinbon series is a compendium of modern horticulture info and bonsai techniques for a given species (the "sodate kata" in the title means "how to grow"). You will need a pretty good Japanese reading ability to get the most out of it. The automated translation engines tend to really suck at Japanese, so pretty much forget about using the camera automated translation of your smart phone.
The Kyosuke Gun series contains a few pages of horticulture and bonsai techniques, but each book is really a set of projects taking you from raw material to show-ready mini bonsai. Some projects take 3 to 5 years (zelkova broom), some projects take over 10 years just for the trunk like (thick tapering trunk moyogi chojubai). There isn't much text once you're in the projects, but the text contains the details and nuances that can't be expressed in drawings. You could almost go through it by knowing a few kanji (日 for day,月 for month,年 for year,葉 for leaf,枝 for branch) and some Japanese conventions (cross means no, triangle means possible but not best, circle means best).
The "Bonsai special class" series would require being at a true native level of reading Japanese and a lot of time to digest the information and chase updates from the 40+ years since publication. The page count per volume is scary, Abe's "pine bonsai" is less than a quarter of the pines volume.