Fourth-grade elementary school student Yotsuba Kokoro is a somewhat clumsy but very kind-hearted girl. "Every object has a soul"—guided by her grandmother's teachings, she cherishes all items dearly. One day, from Kokoro's beloved colored pencils, a COCOTAMA—a deity of objects—is born! Its name is RAKITAMA. COCOTAMA must never be discovered by humans, but RAKITAMA is seen by Kokoro the moment it is born! With this discovery as the catalyst, the two form a secret pact...