Ten year old child prodigy, Chiyo Mihama, is finding it tough fitting in at high school with the girls five years her elder: Osaka (dimwitted with a weird take on the world), Tomo (a powder keg that goes off at a moment’s notice), Kagura (the competitive athlete of the bunch), Yomi (the hothead), and Sakaki (timid and obsessed with a love of animals that isn’t reciprocated). Together with their teacher, they navigate the rough waters and fun times of high school.

In 2026, eleven years after the introduction of internet-connected augmented reality eyeglasses and visors, Yūko Okonogi moves with her family to the city of Daikoku, the technological center of the emerging half-virtual world. Yūko joins her grandmother's "investigation agency" made up of children equipped with virtual tools and metatags. As their research turns up mounting evidence of children who have been whisked away to the mysterious "other side" of reality, they find themselves entangled in a conspiracy to cover up the dangerous true nature and history of the new technology.

After losing her mother and her homeland, Sitara’s despair transforms into determination with the power of knowledge. New possibilities unfold when a family of scholars takes her in, deepening her education. Meanwhile, Genghis Khan’s Mongol Empire conquers nation after nation, nearing Sitara’s new home. After the Fourth Prince of the empire takes her captive, a flame of revenge is ignited.