I wonder how many Japanese have, over the years, gone crazy due to the debt inheritance system Japan has. Basically a person could have lived their life 100% decently, working hard to study, train, build a career, save money, invest what they can, but then a bad apple family member goes and gets an insurmountable debt (squandering it), dies/disappears, and the debt suddenly falls on the family member who had given their all to meticulously if slowly make it in life. At least this Shiori went bonkers in a really good way.