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Originally Posted by ID555
It's probably not because of her achievements - he only found out about her sports and grades sometime between discovering her hobby and the confrontation with their father...... if I'm not mistaken.
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It's not that unusual. Some siblings live their own lives without any concern for their other siblings. The way I worded it sounds a little cold, but some really see it awkward and unnecessary to stick their nose into their sibling's business unless they're forced to.
Kirino did well enough on her own before, so Kyousuke probably didn't feel like he was needed at all. Their relationship goes sour because they never talk up untill the beginning of the series.