The main casting is very good but the direction makes the acting of the characters completely uninteresting. The film is very difficult to watch because the direction and editing are quite bad.
From an artistic point of view, I find the film interesting but I didn't like execution, there was a huge lack of sensibility but from a writing point of view, the film is much deeper than it seems. The writing is very subversive. There are a lot of scenes that I didn't understand, many things are honesly so confusing too ...

Those things being said, I would like to share my own interpretation of the story:

Sozaburo Kano is treated throughout the film by the characters and even by the director as an object of desire, what he can say or think don't matter, he is a simple object at the mercy of male desire. The simple existence of Sozaburo, well beyond his physical appearance, provokes in those men more than obsession but a desire to possessed and corrupt him for their own plessure. He has no say, the desire of men only sees itself.
At no time does Sozaburo, although displaying a constant coldness and apathy throughout the film, ever express his consent. Sozaburo is a victim whose silence is taken as an acceptance of everything that all these men project into him.

We see him very clearly being harassed by this male desire, but he seems not to react at all. He knows his reaction won't change anything. And he seems to not even be suprised but more used to this treatment. It feels like he learned to play with apparences since probably very young, to not only be the victim somehow ... The psychology of this character is truly intriguing, and his story is deeply tragic.

And yet, towards the end of the film everything becomes clearer. Sozaburo Kano is a much more complex than it seems. He hides his real skills, he pretends to be a worse fighter than he is yet we grasp the fact that he tries to deceive the men around him by playing along the role that this "male desire" has forced and imposed on him, precisely we understand that his goal is to use that desire against them.
I see in Kano's actions a fatality, and a silent passivity that is already beginning to investigate revenge.
What is fascinating is that we understand that his agenda is to reverse this narrative of prey/predator spectrum that this male desire has forced on him.

His silence, his coldness seems to be the result of his life spent having to deal with trashy mens whoa bused him, to know how to adapt through the desire of these monsters. And the only purpose for his pain to him, and the repeated injustice of these crimes committed against him seems to be v'olence. He say it early on in the movie, he was there to k'll.
Who Sozaburo Kano loved? No one I think. I believe he has let all those rumours around just to be able to move silently in his plan, he was playing along, but not in their game but his own.

Soji and Kano might have a certain mutal understanding somehow but I also believe Soji loved Kano... I think he might have k'll Kano out of jealousy, because he realized Kano had feelings for Tashiro somehow ...
Kano might have caught some feelings for Tashiro even if he was using him, because Kano seems to be unable to fight Tashiro properly which I believe indicated his probable tourmoil about him. Tashiro forced himself on him for sure but somehow Kano feels something for him .. not sure why or what, but I do believe there is a mix of different feelings, hating him but also having some affection for him (a sort of stockholm sundrome).

Before k'lling him, he asked his forgiviness ... yes, he used this to be able to k'll him but he used truth to be able to fool him, that's why Tashiro believed his words.
Soji pretended he couldn't hear what Kano was saying to Tashiro, but I think he did. His instant pasisonate jealousy led him to k'll Kano.
"This sort of thing has happened before. Hearts inflamed by passion ... It must not happen again."