Big Man Japan was on TUBI or Netflix awhile back. I watched it and thoroughly enjoyed it. It was filmed in documentary style and it followed a Japanese fellow who was pretty much a nobody until he was called upon to exterminate a variety of monsters. When he got the summons, he would go to a type of power plant where he would be 'charged' and turned into a giant and then he would go fight the monster. After the fight, he would shrink back to his normal size and would return to being a relatively unknown person. Very cleverly filmed, and very funny too. The monsters were quite offbeat, as that clip showed. Actually, the first monster utilized a rather gross part of his anatomy as a weapon. Still, a fun movie to watch, and I highly recommend it.