Rin gives birth to twins, Susannah and James. She already has a toddler son named Justin. The story follows the children as they grow from infants to toddlers to children. Justin learns to walk and talk from his grandmother Bella. On their birthday, Justin becomes a child while the twins become toddlers. A few days later, the twins have also learned their skills and become children to join Justin. Rin is exhausted but finds joy in raising her three children with help from her mother Bella.