My idea of why he brushed away Masashi is that he was planning on going to the hospital to get better without the help of Mizutani. And feeling abandoned he abandoned Masashi which made him turn to drugs again and die.
Thanks for the translations! Ikuto lookin pretty drippy in that fit, and those moves were cool too. It seems Jayden just never had a father figure in his life sadly. Also I can't imagine the King being super uptight with a personal guard like that.
I wonder if it is trying to show the, although achieved through odd means, healthy relationship with aoi and minazuki. And the unhealthy possessive relationship with the other 2 girls (i cannot remember names) This manga is a tad bit confusing