Hina, also known as Guardian Hearts, goes to Earth with peace protection mission ... And with strict orders, do not allow anyone to disclose her personality. Therefore, when Cadzua accidentally sees that Hina is transformed just like it arrives on the ground, he is forced to take her home with him. Because it is normal to know about the secret person, if you are from the family, right? At least that Hina thinks so! But as if life with Guardian Hearts was not problematic enough, now the magic girls seem to appear everywhere and reveal to Kazui! Can Kazya survive attention and jealousy of so many girls? One thing can certainly say, the days of Kazuya will be completely boring!