Just to the right of the cat, if you push up you'll start on an invisible walkway toward the chest.
The kissing scene directly follows this first patch of gameplay, just choose the first dialog option at every prompt in the following town.
I don't know if there's more, the format of the game is "play this boring jrpg section, then be rewarded with hentai cg's," whereas I'd prefer something where the hentai and gameplay were presented together. So I won't be finding out.