I am a Bangladeshi living in Japan. How to get a visa for hongkong?

Rana, you can submit the application to the local embassy/consulate or diectly get contact with the Hong Kong Immigration Department and send the required documents by post: the application form (ID 1003A), your recent photo affixed on page 1 of the application form, photocopy of your passport, photocopy of your financial standing proof (bank statements, saving accounts passbooks, tax receipts, etc.) and employment proof (e.g. salary slip), photocopy of your transportation arrangement proof, photocopy of the proof that can justify your visit, and a check.