Hiroko Utsumi, the one behind Hyouka’s 7th episode, the one where Oreki shows us his six-pack, is also behind the swimming commercial.
This explains everything.
I Want To Hold Your Hand
The animation here is superb. Drawing hair is a bitch. Drawing hair underwater is a golden bitch.
"I don't think that this place is the most beautiful. I also don't think that this place is full of potential. But... I wanted you to see it, Oreki-san."