The Hikari Kikan was the Japanese liaison office responsible for Japanese relations with the Azad Hind Government that replaced the I Kikan. It was initially headed by Colonel Bin Yamamoto, later replaced by Major-General Saburo Isoda.
It recruited Sri Lankans, Indians and other South Asians domiciled in Malaya and Singapore for spying missions against the Allies.
References
Hikari Kikan Wikipedia(Text) CC BY-SA