The story follows the protagonist as they live with a relative's child. As the living arrangement continues, the narrative focuses on deepening emotional bonds and the evolving "fate" that begins to weave their futures together.

Naomi had brought with her a small, spherical device that she called "Kokoro" (meaning "heart" in Japanese). Kokoro was designed to be a companion to children, helping them with their studies, emotions, and even protecting them from harm.

The guardian explained that Koume was the reincarnation of a legendary girl who had once harnessed the power of the stars to protect the town of Tomari. However, the previous girl's abilities had been lost over time, and the shrine's magic had begun to fade.

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