Mm… yeah. I think you’re right - that’s the difference.

Seo in the manga is sort of quietly socially awkward - he gets a strained look on his face and thinks to himself about how he’d rather be at home or whatever, and the girls have come to recognize when he’s feeling that way, but that’s about the extent of it. But in this (like with Genichirou in this episode) he keeps going all the way to that full-blown stammering and screeching panic.

And yeah - thinking about it, they got the kind and considerate side of his personality pretty much right - like his interactions with Sayu in this episode.

It seems out of balance because the socially awkward part is too over-the-top.

It’s that much more unfortunate because they’ve shown that they can do balance with Ijichi. She’s sort of balanced in the same way that he is - at first, she seems like the stereotypical brash, loud, genki blonde gyaru, but she’s actually more thoughtful and reserved (and smart) than that. And I think they’ve done a good job with her. Not so much him though.