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One day, while walking her dog, middle schooler Saki stumbles upon a mysterious giant egg that hatches into a peculiar creature—a self-proclaimed "kaiju" with the appearance of a lizard. Despite its grand claims, the creature, dubbed "Tokage-chan" by Saki and her older sister Hitomi, is more quirky than monstrous, and the sisters decide to let it live with them. As Tokage-chan adapts to life in their home, the trio navigates the chaos and comedy of daily life, from unexpected antics to heartwarming moments of connection. Through their unusual new companion, Saki and Hitomi discover the joys of family, friendship, and embracing the unexpected.