Rimuru decides to throw a summer festival resembling the ones held in Japan. The monsters have never experienced a summer festival, but when they hear that it's a party, they go all-in to prepare. All the monsters of Tempest work together and eventually come up with masks, paper lanterns, and even festival floats. On the day of the festival, everyone in the town enjoys piping hot takoyaki, cold shaved ice, yukata, and a Bon dance. In the end, they fill the skies with fireworks as the festival reaches its climax...
You are indeed the leader of 
a nation. So very greedy.
أنت حقّاً قائد دولة. طمّاع جدّاً
Aber so erwartet man es
vom Anführer der Koalition.
Es usted muy ambicioso.
Es usted muy ambicioso.
Eh bien, maître,
votre avidité est sans limites !
Dovevo aspettarmelo da un leader come te.
Não é líder de uma nação
por menos. Que ganância.
Вы настоящий предводитель! 
Королевская жадность!