Originally Posted by
Kraco
I'd say that was the brother's, and also the mother's, personality problem. Those two are most likely quite similar personalities: emotionally stable, not thinking too much about anything useless, goal-oriented, efficient, not too sympathetic by nature in their practicality. So, when shit hit the fan in this sort of manner, they didn't really have any tools to deal with it, since nothing like that could ever happen because of their own actions. My theory is the brother just thought Sayu needs a bit of space, but he had no idea how emotionally damaged she was because it would be alien to his own nature. I reckon he really thought she would live for a week or two in a hotel, then come back as good as new once the money was all gone. Because that's likely the extent of his imagination and everything he himself would have needed.