@d3ban I disagree. Actually, everything Chihiro does to "help" Yugami is just for her self-satisfaction.
Actually, a lot of people around Yugami are busybodies who should just mind their own business. They see him as someone who's necessarily unhappy, because he doesn't have friends and is self-reliant. It doesn't fit with the Japanese ideal that you can only thrive in groups. Actually, they are all trying, including Chihiro, to make themselves feel good and try to reinforce that this ideal is the only way to go.
He enjoys looking at castles for hours and imagine history, alone. Everyone else around him find it boring. So what? He doesn't have to comply to their demands to conform. He doesn't ask, or even
need, their compassion or help.
Most people around him are just hindering him and are just only stopping short of bullying him because he's
different.
I think this is the message from this manga: Yugami didn't change at all from chapter 1, despite all the efforts from the people with "good intentions". But he changed them and without even trying, helped them mature.