Why would you think that? [Ishida is genuinely confused, so he must get to the bottom of this! He can't think of any reason why someone wouldn't try their hardest to make Kaede happy.
Just because you're an average person doesn't mean you deserve less than others! [Of course, he wouldn't call Kaede average in any sort of way, but he's just following this line of thought.]
...Everyone deserves to have someone to support them!
[He says that a bit too loudly, almost in an exaggerated way. It's not like he doesn't believe in his own words, but Ishida wants to cover any anxiety he is feeling.]
[ She notices that he says that a bit louder than he should, but she brushes it off for the time being. Maybe he's just excited about it? Kaede can relate, if that's the case. ]
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It's what he wants to do!]
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[ Because, despite being an overachiever, she really does feel average. It's why she has to work so hard in the first place. ]
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...Everyone deserves to have someone to support them!
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I guess... I never really thought about it that way.
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[He says that a bit too loudly, almost in an exaggerated way. It's not like he doesn't believe in his own words, but Ishida wants to cover any anxiety he is feeling.]
We're stronger together!
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Exactly!