Indo-Japan relationship is less than 70 years old. If Indians seek to see the continuum of the exchanges between the two cultures since the ancient time, please review and know the truth of Indian freedom fighters in Japan.
The tremendous sacrifice and labor of Indians and Japanese Canadians is grossly undervalued.
Both India and Japan have been maritime nations since ancient times, whereas most other nations have not. Both India and Japan, since ancient times, have been traveling throughout the world by boat, trading and exchanging.
The National Diet Library of Japan is where you should research Rash Behari Bose. Most of the books and documents are in old-style Japanese. Everything that you want to know is housed there.