Manga follows the history of 16-year-old mana in an adventure in the Aquarius Epoch. Mana, a sixteen-year-old girl, returns to his hometown to reunite with her childhood friend after he was absent for seven years. But her friend, Canada, it seems, also changed when they were separated. The revival of Mana will soon cause a number of events that change the life of the Canada and his best friend of Nao. Odnoklassniki Isin and Tsukas, and their teacher Tomonori is also attracted. Soon, everyone discovered that they have to play their part in the "Epoch of Aquarius", the war that was carried out secret for thousands of years. Now the future of the world depends on the girl and its fate.