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...
The cold ice and gentle 
sweetness feel wonderful!
!الثّلج البارد والحلاوة الرّقيقة تبدوان مذهلتين
Dazu das kalte Eis mit der leichten Süße.
Großartig!
La froideur de la glace se marie si bien
avec la douceur du sucre !
La freschezza del ghiaccio e la dolcezza 
dello sciroppo fanno bene all'anima!
É maravilhosa a sensação gelada
junto do leve sabor adocicado!
Прекрасное сочетание холодного льда
и мягкой сладости…