If the director defines this as a love story, as Gao Zan said in the previous answer, then who is the love with whom? Kakihara and Hajime? An extreme 100 percent S and an extreme 100 percent M. But if so, what role does Uncle play in this love story? Pimp? Uncle's motive is that it is extremely unlikely that this pair of SM will be facilitated. The biggest possibility is to hypnotize Hajime to use his power to get rid of the underworld, in order to vent the anger of being bullied when he was young.
And Hajime and Yuanyuan are like chess pieces in the game of two uncles who happened to meet. The character of Kakihara, whether it is the scars on his body or the means of abuse, can indeed reflect a desire for abuse. As an ordinary person, I really can't understand it. Perhaps under the extreme despair and collapse, pursuing the pain of the body is also a good way out.
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