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...
I wasn't expecting my 
labyrinth to get all warped.
لم أتوقّع أن تتأثّر متاهتي كلّها
Ich hätte nicht gedacht,
dass mein Labyrinth da so leidet.
No esperaba
que distorsionara mi laberinto.
No esperaba
que distorsionara mi laberinto.
Je ne m’attendais pas
à ce qu’il déforme mon labyrinthe.
Ha fatto distorcere pure il mio labirinto...
Eu não esperava que até causasse
distorção no meu labirinto.
Я и подумать не могла,
что мой лабиринт так изменится!