Yamamoto has updated the game with the new after story, I will play and let people know the content of the update, like how many new scenes if its worth a walkthrough. Unlikely anything big, probably just a few new scenes depicting what happens after the true ending.
If you've purchased the game all you need to do is re-download from the page and it should be updated with the new scenes.
You must be registered to see the links
You can access afterstory with a true ending save from the main menu
Update has 4 new scenes 2 with blonde, 1 with black hair and with all 3
1st scene is upstairs with the chair,
2nd is in the kitchen
then go upstairs to the top left then go to the ball puzzle room across the beam for scene 3
then finally the main hall doors should be open for the final scene enjoy!
