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...
One day, in the midst of a very hot summer,
،ذات يوم، في منتصف صيف حارّ جدّاً
Die Hitze nimmt nicht ab.
Es ist Sommer.
Un día caluroso de verano,
Un caluroso día de verano,
Alors que la chaleur estivale
sévit toujours,
In una bella giornata di questa caldissima estate,
Certo dia, entre tantos outros
dias quentes do verão,
Одним жарким летним деньком…