I don't think that the relationship between them is romantic, I think it is more complicated than that, kyouji's feelings for satomi are how he wants to be needed in someone's life because he doesn't have any one like that in his life,and cause he is a gangster, so having a normal relationship with someone "normal" like satomi is his way of staying sane in this "abnormal "life And for satomi's feelings, I think he is scared to care for kyouji, because someone like that can disappear "die" from his life without a warning, so he doesn't want involved or be there when that happens, that why he asked kyouji if he can leave the gangster life. What I'm trying to say is both of them like each other and want to have a life together, but both of them are scared of admitting that.
I don't think that the relationship between them is romantic, I think it is more complicated than that, kyouji's feelings for satomi are how he wants to be needed in someone's life because he doesn't have any one like that in his life,and cause he is a gangster, so having a normal relationship with someone "normal" like satomi is his way of staying sane in this "abnormal "life
And for satomi's feelings, I think he is scared to care for kyouji, because someone like that can disappear "die" from his life without a warning, so he doesn't want involved or be there when that happens, that why he asked kyouji if he can leave the gangster life.
What I'm trying to say is both of them like each other and want to have a life together, but both of them are scared of admitting that.