Well Goons, a few of you picked the ‘correct’ option right off the bat. Well done, lady killers.
That's less interesting however, so let's see what happens when we choose all the wrong options first.
Rock

Yeah! Looks like Kayo-chan’s getting into it! She might be the type to want to make out to Guns N’ Roses.

But it seems like Hiro is not...
I think maybe this is more about setting the right mood for Hiro, not Kayo-chan.
Man's Life

It’s a good sign. Kayo-chan grabs a microphone from nowhere, and starts singing along.
The lyrics seem to be something about how a man’s life blows full winds…

Kayo-chan seems to be enjoying herself, but perhaps men blowing wind isn’t exactly the image Hiro’s trying to project.
Good at Separating
This must be some sort of sad song about relationships, because Kayo-chan immediately starts ugly crying.


Ok, agree that song was probably not conducive to making out.
Lake

Nailed it... Wistful... romantic music.

:
I love this song!

:
Alright, good job.
Ok goons! Now we’re finally getting somewhere…
Ding Dong!
…Oh what the fuck... this better not be Kino again.

:
Who could it be?

:
Kino maybe? I think I'll be out.
Oh good, Hiro’s on the same page. Everybody, just stay quiet and maybe he’ll think we’re not here.
Ding dong!
Grr… Again?

:
Hey it looks like someone’s here?
Gah. Can’t hide this anymore.

:
It is a newspaper commentator. He’s persistent.
Ooh smooth move Hiro, putting a little white lie out there about it so it makes you look important in front of the lady. Clever thinking.

Oh, fine, just let yourself in…. wait. …hello there… Kayo chan, did you invite… a friend? 


:
Who is this person?
…Evidently not.

:
Seriously?

:
Irusu, it’s sweet, even if you use it.
Side track - I looked up what ‘Irusu’ meant. Apparently it’s one of those words that doesn’t have an equivalency in English. It translates to ‘Pretending to be out when someone knocks at your door’.
I love that the Japanese have a dedicated word for that.


:
I don’t know this person !

Well, I’m just pretending not to understand.

:
I’ll give you a refund today.

:
Let’s do something good this time…. Hitting? 

… What in the world?

:
What’s up with you, red person?

:
Hiro is a liar!
*SLAM*

:
What on earth is this?
Gah, now both Kayo-chan and... whoever red person is... just left our apartment!
We’ve gone from no girls, to two girls, to no girls again
.