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...
Festival preparations came 
together at breakneck speed.
سارت تحضيرات المهرجان بسرعة فائقة
Mit einer erschreckenden Geschwindigkeit
schritten die Vorbereitungen des Fests voran.
El festival estaba listo
en menos de lo que canta un gallo.
El festival estuvo listo
en menos de lo que canta un gallo.
À une vitesse effarante,
tout fut prêt pour le festival.
I preparativi per il festival sono stati conclusi 
con una velocità spaventosa.
O festival foi preparado numa
velocidade impressionante.
С пугающей скоростью
собирались декорации для фестиваля…