@BCS
hikkimori = uncomfortable with other people, and typically means abnormal sleeping times since you don't have a fixed schedule, it doesn't mean you don't keep yourself clean
I agree once every 3 days is a lot more frequent than the average, but japanese probably do value cleanliness more.
@lauermeer
she gets agitated when she sees lots of money being spent. https://mangadex.org/chapter/856277/1
You can think of it as a survival mechanism she developed to keep her
poor family's finances stable, but she
developed a bad habit of lecturing other people (especially rich people) like toshirou
so yes,
she is wrong for lecturing him, but old habits (that she needed: to keep herself mentally healthy) die hard.