Rikuo Nura, is 3 parts human and a quarter Demon, lives in a house of spirits with his grandfather, The current clan head of the Nura youkai. Rikou is set to be the next clan head, despit the fact he dilikes his demon side. He soon come to terms with his demon blood and decides to take his position as young master of the Nura house. However there are those who will certainly not allow it to be easy.

The story revolves around Koyomi Morishita, a clumsy high school freshman girl who is often mistaken for a grade-schooler because of her shortness. Koyomi becomes a disciple of Misa Anehara, a 25-year-old graduate student who happens to be one of the most powerful modern-day magicians.

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The story centers on the Platonic Heart, a jewel that—according to an old urban legend—can grant any wish when collected. Only a chosen few are allowed to compete in the Platonic Heart hunt, and high school junior Aya Iseshima is one of 11 girls and women who are taking part.