They are added gradually. For now:
- There's a second game you can buy at Otaku Kingdom;
- The dev decided to switch the manga to books instead; you get the first one by defeating the final Lv.10 chess opponent AFTER the chess tournament (you need find the extra opponents across the city and beat them one by one);
- You can find the "Vendor of Oddities" in the park (north of the Square) during weekend to buy the third game and the second book (he only sells once a day so you need to visit him again for both).
Yes, that's most likely what the choices lead to. So far, we've had two choices like this. The first one was whether or not to kiss her during the previous event.