Do you provide product manuals of Jira Software both Cloud and Server in Japanese at Jira Software Support or ATLASSIAN Community?
If you have PDF files at latest version, attach those files please.
(Any formats are also OK.)
FYI
https://ja.confluence.atlassian.com/jirasoftwareserver/jira-software-server-8-12-documentation-938845020.html
https://www.atlassian.com/ja/software/jira/guides/getting-started/basics