Shuna and Shion argue frequently over Rimuru's gelatinous body, prompting him to consider giving them each a clone of himself as a solution. However, he hesitates due to the possibility of other companions demanding the same favor. With a sudden brilliant idea, he decides to create a pillow in the shape of his slime form instead. In his search for the perfect material, he consults with friends who suggest a lake at the forest's edge, but he soon discovers a ferocious creature lurking there. To add to the chaos, Milim becomes aware of Rimuru's picnic plan and charges towards him from the sky.