Guru Guru

Guru Guru (グルグル) is the theme magic archetype in the Mahoujin Guru Guru series.

Background
Long ago, the Migu Migu tribe discovered the magic which has been protected for it to be used by only those from the tribe. With the circle as the denominating factor, various effects depend on the pattern drawn. But the true factor of the magic is the caster's heart.

Despite Guru Guru being classified as dark magic due to its unstable power, the fact is determined partially as it is neither light, but a "third" attribute in between both.