"The Past" is a keyscene created for the game design project Lilyveil, featuring the characters Gil and Eaban. 

Here is the accompanying description from the Lilyveil artbook:

Three years before our story begins, two best friends would lie in the quiet grassy meadow outside of Lilyveil for the last time. They would spend every day together, enjoying their happy lives in their peaceful village. If only things could’ve stayed like this forever.