Sampei (8) and a bunch of other boys wearing only loin-cloths go swimming. As Sampei begins taking his clothes off, he discovers he forgot his loin-cloth and pulls his pants back up. The other boys tell him he doesn't need one so he takes his clothes off and walks toward the water. He then changes his mind and puts his clothes back on and says "I'll watch your clothes." Full frontal and rear nudity.
One scene is starting with a close-up of Daigoro's bare bottom, then showing him from a distance. It's not quite clear what he's doing, probably cleaning something by using his pants.