This is the rare one. The first sequel, released in Japan in 1955. It's been hard to see for all of this time. I've seen all of the other Godzilla movies multiple times, but I had never seen this one until I got hold of a very nice DVD recently. Full length, in Japanese, with English subtitles (or in a dubbed version, both are on the DVD).
The fellow on the right is the best friend, Minoru Chiaki. You may remember him from Seven Samurai (1954?), where he played the likeable but very strong, heavy set samurai who was an old comrade of Takashi Shimura's. (Takashi's in this movie too, same professor as in the original Godzilla). He was in a lot of really high quality movies, starting out with Stray Dog in 1949. Always the best friend. He died in Seven Samurai, and he dies in this movie too. The curse of the best man.
There's a long interlude of peaceful human interaction after Godzilla kills Anguilas, but off course the G-Man returns. They "kill" him by causing avalanches that buries him in snow and ice.
Very good music in this movie, too. It echos the themes of the original, but is simultaneously more martial and less strident.
It's a good movie. I have no idea why it's been kept so under wraps all of these years. It's certainly better on all counts than some of the '60's movies. Better human characters, better story, better acting, better monster fights. I'm glad that it's out there to see at this point.