Wow. Just wow.
So much to talk about here. Where do I even start?
Okay, first, her dad. Erm...he changed too much? In the end he looks like sleazy film director, and it's, erm, slightly unbelievable. What's even more unbelievable is that he left his daughter. I mean, his wife is meh but he actually loved daughter. To put it rudely, I understand why he got an affair, but I don't understand why wouldn't he at least try to take his daughter with him (I know, I know, it'd pose multiple different problems, but still). It's like, I don't know, he became inhumane or something.
As with her first boyfriend...hrm, Hizumi became desperate. To love unconditionally and be so clingy... I'd rather believe that she became apprehensive and stopped trusting men than this. It's especially jarring after she cut ties with Orochi. I'd rather she dated her than...that. I mean, men can't be trusted.
All in all, this is just a roller coaster clusterfuck royale. I can't say any more than "poor, poor people".
P.S. I want p.31 in color
I agree with you on both points. At the very least, instead of going for something more complex, the author just went for the route of
"Look, Hizumi tried her best! But their true selves were just selfish assholes. Hate them! Hate them!"
Really, that's all there is to it?
The Dad's sudden change into the cliche asshole archetype was just jarring. The entire story beat with the ex was just unrealistic. You're telling me another girl went for that soft boy otaku loser? I fucking wish, LMAO. He wasn't a playboy, he was a nervous insecure kid. If anything, getting pampered should have made him entirely dependent on Hizumi leading to some other sort of fallout.
My final critique is that it was hinted throughout the series that Hizumi's treatment of Shinba was sort of a mix between the two extremes that were her treatment of the other two guys in her life. Hizumi gave Shinba equal parts support and disparage to keep him in her Goldilocks zone. I think it would have been a lot more interesting thematically to lean into that:
1. Hizumi supported her dad, so he left her because he felt had potential and his family was dragging him down. This is 100% the Dad's fault, but there is a hidden blame on Izumi. However, Hizumi is 0% at fault here, but she blames herself when the hidden fault lies with Izumi for stunting the Dad's growth and being unsupportive in the firstplace.
2. Hizumi finds someone and tears them down to ensure they never leave. That person's self-worth is obliterated and see themselves as holding Hizumi back from her potential, so they leave her. Alternatively, something or someone makes them realize they are not worthless, stand up to Hizumi, and leave. Either way, Hizumi is 100% at fault here.
In Hizumi's obsession with not repeating her father's departure, she inadvertently repeated her mother's mistake.
I think going this route would have been a lot more interesting, but I am not a writer, so...