On Mount Chocodale lives a round, fluffy rare creature named Chocojiro, a mischievous food lover with a habit of ending his sentences with "cho." After a human child shares a chocolate biscuit with him, Chocojiro is so delighted by the combination of crispy biscuit, milk cream, and chocolate that he begins imitating human behavior. He renames himself Sakuyama Chocojiro and sets out to spread the joy of chocolate biscuits to everyone he meets. The story proper begins when two high school girls, Tomocho and NonP, visit the mountain and befriend Chocojiro. Watching the girls' everyday actions, Chocojiro tries to copy them—putting on clothes, eating like a person, speaking in full sentences—but his clumsy, earnest attempts are endearingly offbeat. The girls find his awkward mimicry adorable, and a warm friendship develops. Chocojiro's mountain companions, including the friend Sakuta, occasionally join the antics. Each short episode centers on a simple comedic slice-of-life moment: Chocojiro learning a new human gesture, trying to prepare a snack, or sharing his beloved chocolate biscuits with others. Over the course of the series, Chocojiro grows more confident in his human persona while retaining his innocent, snack-obsessed nature. The narrative arcs are episodic and gentle, focused on friendship, discovery, and the simple pleasure of a shared treat.