Looking for logging into the Salesforce Developer Edition site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Salesforce Developer Edition site. After that you can login as usual with your login credentials.
https://login.salesforce.com/?locale=jp
https://developer.salesforce.com/docs/atlas.ja-jp.api_rest.meta/api_rest/quickstart_dev_org.htm
https://developer.salesforce.com/page/JP:Getting_Started
https://developer.salesforce.com/forums/?id=906F0000000DCY5IAO
https://developer.salesforce.com/signup
https://blog.momokuri777.com/entry/2017/01/05/000000
https://qiita.com/haruto167/items/8afb35590a8622d7e218
http://blogjp.sforce.com/2016/04/trailhead-4997.html
http://salesforcedevelopersjapan.github.io/lightning-connect-tutorial/create-developer-edition.html
https://intellipaat.com/tutorial/salesforce-tutorial/creating-salesforce-developer-account/
http://developer.force.com/chatterdevchallenge/challengeLogin
https://qiita.com/stomita/items/8b0456d416dc09d2e19a
https://tyoshikawa1106.hatenablog.com/entry/2017/02/19/150532