Also, intercostal neuralgia can be caused by anxiety or severe stress, which totally lines up with his situation back then.
That could be, however, I still think the physical abuse is what caused it. From the book...
pg. 28 - Until when do you plan to continue being such a bad disciple?!”
Masaya kicked my
back. The violence and abuse continued for many hours, until they decided to stop and I completely
gave in. That night, it went on for over three hours.pg. 29 -
Yet, Moritani kicked my back and stepped on me very
heavily. With the impact of her stepping on me, for a brief moment I opened my eyes and saw the cuff
of someone’s pants and they removed their slippers. These were Masaya’s feet.
Many, many times,
he hit me in the head and face with the slippers, the tingling pain echoed on top of my head. Then,
Masaya yelled together with the others. “You’ve seen that person dead, now you’re disturbed,
bastard! The future of egoists in a visual rock group like X Japan is suicide! You know that, you beast!
If you don’t participate in our
trainings, the same will happen to you! Get this through your head!”
Many hours passed, still with the
abuse and violence. But in the end, I was unable to cry or scream.
pg. 55 - The atmosphere in the
flight was relaxing,
but I had pain from being kicked on the back the previous night, the usual pain in
my chest, and throbbing pain in a part of my face. As I tried to withstand these pains, I stared at the
window, thinking in nothing else but how I would plan my escape. (But, no matter which way or how
I escape, there’s no doubt that Moritani would go after me...)
When I closed my eyes, I saw her evil expression.