Japan is the worst country on Earth, its citizens are deprived of the meaning of life: Change
They can't change authority, they can't fight back against their toxic boss that is overworking them with little pay, they can't make friends outside of work or school, they can't change the mindset of their parents that scold them for a minor mistake on a test, they can't stop seeing other people live better lives on billboards, they can't change their diet of goyslop instant noodles because they work overtime everyday, they can't change their situation because society will look down apon them as a weakling, they can't change the fact that young Japanese adults are growing crazier in silence.
No wonder they have some of the highest suicide rates in the world, and some of the most gruesome criminals to come out of it when they do unleash their craziness.