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.
You must be grateful to 
her as well, Ryuzu-kun.
لا بدّ أنّكِ مُمتنّة لها كذلك يا ريوزو-كن
Du musst ihr auch
dankbar sein, Lewes.
Hemos de estarle agradecidos, Ryuzu.
Hemos de estarle agradecidos, Ryuzu.
Tu dois être redevable envers elle,
tout comme moi.
Le sarai sicuramente molto grata anche tu, Ryuzu.
Você também precisa ser
grata a ela, Ryuzu-kun.
Так ты тоже 
признательна моей наставнице?