Rimuru is building a dungeon in preparation for the upcoming festival. It will feature treasure chests containing weapons made by Kurobe, and Veldora will inhabit the deepest floor as the final boss. Then Milim suddenly shows up with a suggestion...
But wouldn't that go 
against your promise to Guy?
لكن ألن يخالف هذا وعدك لغاي؟
Aber davon hält dich
dein Schwur gegenüber Guy ab, ja?
Pero eso va contra
tu promesa con Guy, ¿no?
Pero eso va contra
tu promesa con Guy, ¿no?
Mais alors, tu reviendras
sur la promesse que tu as faite à Guy.
Ma questo andrebbe contro
la promessa fatta a Guy, no?
Mas isso não contraria
a sua promessa ao Guy?
Уверена?
Тогда ты пойдёшь против клятвы Гию.