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...
Both parties and festivals 
bring us all together as one.
الحفلات والمهرجانات تجمعنا معاً كجسد واحد
Das Sommerfest
Los festivales, sean como sean,
unen a la gente.
Los festivales, sean como sean,
unen a la gente.
Les banquets et les festivals
unissent les gens.
Le feste e i festival uniscono le persone.
Festas e festivais nos unem,
como um só.
Праздники и фестивали
объединяют наши сердца!