Amisawa-san, Do You Cosplay? - S1.E5

Kaos and the other girls end up at the beach, solely because Koyume tells them, “Because it’s summer!” However, Koyume was the only one who brought a swimsuit, because she’s the only one who had the idea of actually having fun at the beach, so she takes them to the rental shop so they can all get swimsuits.