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...
Mister Garm and Mister Dord worked very hard 
to design custom swimsuits for all of us!
السيّد غارم والسيّد دورد عملا جاهدين لتصميم
أزياء سباحة مخصّصة لنا جميعاً
Jeder Badeanzug wurde unter großen Anstrengungen
von Garm und Dold extra angefertigt!
Chacun de nos maillots
I nostri costumi
As roupas de banho de todos aqui foram criadas
com muito cuidado e sob medida por Garm e Dord.
Мастера Гарм и Дорд себя не жалели,
 чтобы у всех были прекрасные купальники!