Karin, 16yo... Fuck no, you're shitting on us author. She looks like a 20 yo college girls at least. How can she wears those fancy clothes ? High heels, miniskirt, jewels... Did she comes from a party, a one night stand, her sugar daddy ?
16... It's unbelievable but maybe it's me...
But I'm pretty sure the author gives her this looks to make it less cringey and disgusting when she's next to Hiro's dad.
The fact that she has a crush on Hiro's dad don't bother me (we all had a crush on someone older than us when we were teenager) but he better not be one of those guys going for underage girls and also I hope the author will not depict a 16 yo as some seductress who's going to flirt, seduce and success to sleep with a 38 yo dude.
But looking at the clothes the author gives her, I think I already have my answer.
I'm putting aside that they all have a crush on someone base only on their looks, again they are teenager so it's comprehensible. And Hiro seeing Karin as some kind of exotic, unnatural creature just because she's pretty... Whatever.... I'm not sticking with this one.