My biggest issue with the story is probably Takaharu himself. Not his inability to asking questions but him being mentally stuck with a girl he dated for like 5 months when he was like 18-19 for almost 20 years. And as far as we can see from their past flashbacks, it wasn't some over the top telenovela tier relationship either. If anything, it was pretty much a nothing burger. She left. Didn't even contact him once for 17 long ass years but dude is still in the exact spot she has left him. Both mentally and socially. Way too convenient just to make the bait part of the bait and switch applicable since he apparently doesn't even care.
She is probably the luckiest woman on earth to land a backup like this in such a short period of time.
Except we get some justification for that side of him in the story.
In chapter 14 when he's sleeping and dreaming about Kyou, we get the flashback to when she broke up with him, and part of him realizes it's because he was so focused on his artwork that he neglected her ("neglected what was actually important").
But--she was also a model for his work, and more importantly for his
best work. One of his last conversations with Kyou was talking about how he'd have to work even harder to put together material for the gallery showing, because the rest of the group ditched him and Azuma. He had to use a bunch of pieces centered around Kyou as a result, and
those were the ones that everyone who attended resonated with the most.
So he had all of the best qualities of Kyou, thrown back in his face over and over and over again. The very things he captured in his art, that strangers
noticed and picked out, and they were things he himself missed in the real life person until she was already gone.
That sort of thing
will have a lasting impact on a person. The best art he makes, the pieces that leave the biggest impact on those who see them, are the ones of Kyou. She is tied to him intrinsically, in the one manner with which he acts upon the world around him. And he can't talk to her, because he already let her slip through his fingers, only to be constantly reminded of her every time he puts pen or brush to paper or canvas, and every time someone comments on a piece that's either of her, or a product of her impact on him.
To me, him going 17 years with
that following him around, makes perfect sense for why he never let go.