Extreme summer heat is ravaging Tempest. Rimuru and crew visit a lake they've been told lies beyond the forest, and they change into swimsuits to start having fun... but Shion and Shuna seem dissatisfied with Rimuru's swimsuit. Veldora watches the gang from inside Rimuru's body as he plays a game of shogi with Ifrit. As the Storm Dragon, one who has never experienced swimsuits or water play, he struggles to understand what all the excitement is about...
There is no guarantee that you 
will be laughing tomorrow.
لا أحد يضمن أن نضحك غداً
Deshalb ist es nicht garantiert, dass wir auch
morgen noch so ausgelassen sein können.
Quién sabe si podrán
seguir riendo mañana.
Quién sabe si mañana podremos divertirnos.
Rien ne garantit
que vous rirez encore demain.
Non è detto che d'ora in poi, o forse già domani, 
ci sarà ancora da sorridere.
Далеко не факт…
что вам всегда будет так же весело.