It is simply not healthy to be so angry all of the time. My money is on Kagami dead at 19 from myocardial infarction brought on by chronic but moderate stress due to her obvious emotional disorders. She will die alone in the one small walkpath of her apartment that isn't full of collected detritus, canned food, and piles of long-expired classified ads from years worth of newspaper subscriptions. Misunderstood and isolated, no one will mourn her passing.
