Thank you for your time!Chapter 1 used RPG Maker engine while Chapter 2 use Ren'Py. To play through the entire story you need both.
I personally would recommend to download the Ren'Py remake of Chapter 1 - here: https://f95zone.to/threads/anna-exciting-affection-unofficial-renpy-remake-v2-0-osmcuser132.8482/
Enjoy the game.