sorry if it sound too obvious but i want to said it.
i’ve always think that those two series merely a game that played by Bern and Lamda. Lamda is player 1 and Bern is player 2. like we play console game compete in the game and changed the CD so we can play another game.
in epilogue they she said “we will meet again when something cry” i guess their game always related to it.
pic by me