Some of these pictures and descriptions may give away plot details that you might not want to know before watching the film.
One of the members of a boy's fighting club pulls a snake out of his shirt and puts it on a table. Then he takes a homemade mace he just made, a ball of stuff with nails sticking out from it, to be used a gang fight soon to happen, and swings it down at the snake. We don't see it hit the snake. Later he picks up what looks like a dead snake from the table and flings it around his neck and walks away. (We can see the snake moving, not looking dead at all, but I presume we're supposed to assume he really smashed it.) Examples of animal cruelty like this show how weak and powerless somebody is that they need to destroy a harmless and defenseless animal, but instead I suspect that Seijun Suzuki, the director, means to show us how tough he is. I didn't enjoy this film nearly as much as Suzuki's films that came before and after it - Tokyo Drifter and Branded to Kill, two of the best Japanese films of the '60s.