The developers one day get up and want to popularize the game so they invent a new mechanic in the game to turn players into speedrunners and publish their records determining how many days you spend in the game your interaction with Calla will have different results taking into account that time passes differently between dimensions
7 Days, You can impregnate Calla
90 Days, You simply rescue her
300 Days, She is a Milf with several kittens, currently a widow, do not ask (You can only have a friend relationship with her)
1000 Days, Old Granny who is no longer able to recognize her sister
Weeks later the players somehow defeating Kayssa before going to sleep on the first day.