He died because he had drunk so much alcohol.
Really? omg... Thank you for the answer!
no probヾ(❀╹◡╹)ﾉ~
I didn't read on once he died... that was truly injustice in the story world. a depressing meaningless plot to kill off one of the key players in the plot. The appeal of the story just disappeared. I was reading this manga because I hoped that he'd have a good end. He was suffering the injustice of a society, romance etc etc when he's just a soft cinnamon roll. T_T Life is too cruel! Not even giving him a second chance to get back up.
I don't understand: why did Koremori died? He was sick, but what was his illnes? I can't understand! I cried when he died but I don't know why.