At Sanwa Nursery, young girls with pure and innocent hearts spend their days in carefree joy. Today, we sneak a peek at Mako-chan and Runa-chan happily playing together. Their toy play is so much fun that Mako-chan can't hold her bladder any longer—on the verge of bursting, she wets her disposable diaper. Noticing this, we call Teacher Iori to change her diaper. As Mako-chan cuddles sweetly with the teacher, Runa-chan watches with a hint of envy. Later, during singing time, as they joyfully sing a round of "Kawazaru," an unexpected incident occurs. Though Runa-chan should be able to go to the toilet alone, a wet stain spreads across her pants. Did seeing Mako-chan's diaper change make her jealous? Runa-chan ends up making a puddle on the floor and wets herself too. Seeking comfort from Teacher Iori, she gets a fresh disposable diaper just like Mako-chan's. Wearing matching diapers, they enter nap time. Excited by their coordinated diaper look, the two girls hold hands and pee into their diapers together. Admiring the cute rabbits printed on each other's diapers, they swap wet diapers as a sign of reconciliation. Feeling their friend's urine against their thighs, they peacefully resume their nap. What kind of dreams are these girls who love to wet themselves having now?