Hehe, you couldnt tell?
Not to brag, but I thought they telegraphed it well- he's just a lot smoother
than Yuuji is, and well, most anime males in general. He's doing his best
to be kazumi's friend, and she is clearly willing to confide in him and spend time
with him.
If he wouldnt have forced the issue so quickly at the picnic, he could have spent
more time with her. Maybe offering to help her shop for things or Yuuji or whatever,
then once on the date with her, only talking about her and interesting things, and basically being charming and friendly in general....
Hehe During the part when Kazumi ran off I felt like turning to hayato and saying 追え。
I do like how yuuji saw through him though- remember he doesnt have
all the 3rd person viewpoints we get as an audience, so im impressed that he
figured him out like that...