A mother cat named Milly gives birth to her first litter of four kittens, including the one who will later be known as Zoccha. The story follows the family from the moment the newborns arrive, tiny and mouse-like, through every stage of kittenhood. Milly, a devoted and sometimes anxious parent, must learn to care for her babies while grappling with her own uncertainties about their rapid development. The kittens themselves experience a world full of firsts: first steps, first toys, first explorations of the garden, and the growing awareness of their own place among their siblings. As they grow from wobbly, fur-covered infants into confident, independent young cats, the bond between mother and children deepens, but so does the quiet knowledge that their time together is limited. The narrative arc moves from the wonder of early discovery through the busy, playful middle period and ultimately toward the bittersweet inevitability of separation, as the kittens are adopted into new homes. Throughout, the manga captures the warmth, humor, and gentle melancholy of watching a family grow and change.