1) Why is Karyl making that face?
2) Why does Kokkoro have a baby's bottle?
3) Two characters on top balcony are not tagged, but I'm not familiar enough with the game to tag them.

Naked_Flame said:

1) Why is Karyl making that face?
2) Why does Kokkoro have a baby's bottle?
3) Two characters on top balcony are not tagged, but I'm not familiar enough with the game to tag them.

1) My guess is Karyl being tsundere. And her making faces is funny.
2) To quote the author:

騎士君はまだあかちゃんなので・・・

In short, our hero is still a baby that needs to be fed by mommy Kokkoro :)
3) That's why I didn't tag them, I'm an animeonly-watcher, so I'll leave it to those well-versed in the mobage.