KNY/Demon slayer reacts

This take place in the trial but than all suddenly a bright light appear in a room that full of grass and wonderful color of flower there a screen show.
How they react to the story of past, future, au and etc.

Also there no yaoi or yuri I afraid I don't do these story for a reason you can ask why I answer.
warning:
Insects(If you don't know what mean it word of blood related in love with one another.
This story will had cuss word.
Offend moment.
Gore.