The magician Lapis is the youngest daughter of the distinguished Idocrase family.
Her parents and four brothers are all elites with great magical power. However Lapis only has lower than ordinary magical abilities, she spends every day at magic school getting ridiculed as the 'Burden of the Idocrase Family'.
In order to go to a higher school, she challenges a certain test. The details are to gather the 'Twinkle Gem' that is created from a strong 'feeling' in a human's heart.
And so Lapis goes to the human world in high spirits, where a bunch of hard-to-deal-with men is waiting for her.