In lieu of a more obvious place to post, here is a summary of opportunities to buy tickets for next year's World Cup in Japan:
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0. You have to get a “Ticket ID” by registering your email and personal information. You will need a credit card to purchase.
Master Card holders have twice as many chances as others.
https://tickets.rugbyworldcup.com/
1. First round
Application period: 2/19 – 3/12
Result announced: 3/26
Payment: 3/26 – 4/4
Condition:
Become a member of Japan Rugby Football Union Members Club (Initial fee: JPY1,000 and annual fee: JPY3,500) during the application period or
メンバーズクラブ入会|日本ラグビー協会メンバーズクラブサイト
Become a member of Sunwolves Official Fanclub (Annual fee: JPY4,000 for basic plan) during the application period
SUNWOLFPACK
2. Second round
Application period: 3/19 – 4/12
Result announced: 4/26
Payment: 4/26 – 5/5
Condition:
Residents who live in the 12 host cities of the matches including Tokyo. Residents in Tokyo can buy tickets of matches taking place in Tokyo only. On 29 Sep 2019, Wallabies meets Wales in Tokyo.
3. Third round
Application period: 4/19 – 5/12
Result announced: 5/26
Payment: 5/26 – 6/4
Condition:
Become a member of fanclubs of one of 16 teams in the Japan Top League during the application period. (Membership fee varies from zero to JPY4,000. NTT Docomo RedHarricanes is zero.)
ファンクラブ | NTTドコモ レッドハリケーンズ
【2017年版】トップリーグ全チームのお得なファンクラブをまとめたよ! (Membership fee info)
4. Fourth round
Application period: 5/19 – 6/26
Result announced: 7/10
Payment: 7/10 – 7/19
Condition:
Become a member of Rugby 2019 Supporters Club during the application period. (Free mail magazine run by the Organising Committee)
Rugby World Cup 2019
If you become a member of one of these organisations (JRFU, Sunwolves or rugby teams to be entitled for the first, third and fourth round), you have to add the access info to your “Ticket ID”
利用ガイド | RWC2019公式チケットサイト (only in Japanese)
You can buy six tickets maximum. You can only select the category, but cannot select seats.
Purchase tickets here:
https://tickets.rugbyworldcup.com/