When Roswaal happily tells the story of how his romance with Echidna began 400 years ago, Beatrice rebukes him for casually calling it a "romance." Ryuzu interrupts to comment that Echidna saved her, as well. The one thing these three very different people share is their gratitude toward Echidna. But their days spent in both amicable and argumentative conversation about Echidna are brought to an end by one man's arrival.
That would mean you now know what 
happened that day, too...
معنى ذلك أنّك تعرف الآن ما حدث
...في ذلك اليوم أيضاً
Das heißt, du hast auch
von jenem Tag gehört.
Entonces, también deberías
saber lo que ocurrió ese día.
Entonces, también sabrás
lo que ocurrió aquel día.
Tu sais donc aussi
ce qui est arrivé ce fameux jour ?
Credo significhi che ora sai anche
 cos'è successo quel giorno...
Ou seja, você soube do que
aconteceu naquele dia...
В таком случае ты наверняка
 знаешь, что было после.