It's day one of the festival, and Rimuru finally gets to see all of his friends' performances and presentations. As he's enojying the festivities, he's summoned by Luminus...
Frankly, I had underestimated 
you and your people.
بصراحة، كنتُ قد استهنتُ بك وبجماعتك
Ich muss gestehen,
dass ich euch nicht ernst genommen habe,
Admito que los subestimaba.
Admito que os subestimaba.
Pour être franche,
je vous avais sous-estimés.
Sarò sincera, vi avevo sottovalutati.
Sinceramente, eu subestimei
você e seu povo.
Признаться, я вас недооценила.