Welcome to Japan, Mr. Bond is both a quote from and was also a tagline for the James Bond movie You Only Live Twice (1967) which this documentary is a promotional television special for.
The subplot involving an actress trying to win the role of Bond's wife in a film version of On Her Majesty's Secret Service references the fact that OHMSS was originally scheduled to be the Bond film released in 1967 but You Only Live Twice was produced instead.