[TwilightsCall]

Originally Posted by immblueversion

It features Battler and Beatrice talking to each other, but it also seems to involve a third character whose voice I don't recognize. You don't suppose it could be Higanbana's main character Marie Moriya, do you?

Sounds to me like its

Spoiler for Episode 6:

the resurrected/'young' Beatrice that Battler created when he tried to bring back Beatrice in the sixth game. Not entirely sure though, only clue I picked up was that she referred to Beatrice as her older sister, and Beatrice referred to her as her younger sister (literally calling her "Younger Sister").