Invertia (meteor storm)… an unprecedented disaster that struck the world during the 20th century. 
 
Because of this disaster, numerous cities around the world were destroyed. However, within the meteor, an unknown element called mana (the all-encompassing element), was discovered, which allowed human technology to make rapid strides. 
 
This also gave rise to a new species of human born with unique skills – the Star Pulse Generation (Genestella). 
 
The setting for the world’s greatest comprehensive battle spectacle, the Festas (Star Warrior Festivals), is an academy city above the water surrounded by six academies called Rikka also commonly known as Asterisk. Having transferred into Seidoukan Academy in order to fulfill his own wish, scholarship student Ayato Amagiri swears he too will fight in this city. 
 
Burning souls race… 
 
The curtain rises on this school battle spectacle! 
 
(Source: Crunchyroll)

The Academy City on water, "Rikka". This city, otherwise known as 'Asterisk', was famous for being the world's largest stage for the integrated battle entertainment &lt;Star Wars Festival&gt;. The young boys and girls of the &lt;Starpulse Generation&gt; belonging to the six academies made their wishes with Shining Armaments in their hands, vying for supremacy -- Amagiri Ayato is one of them. 
Ayato arrived at Rikka at the invitation of the Student Council President of the Seidoukan Academy, Claudia, and right after that he incurred the wrath of the &lt;Petalblaze Witch&gt; Julis, and ended up having to duel her. 
The greatest academy battle entertainment, begins here! 
(Source: jCafe24)

Second season of Gakusen Toshi Asterisk. 

Less than a century ago a meteor collided with the planet's surface and the resulting disaster caused the next generation of humanity to develop a wide variety of amazing abilities. In the center of the meteor's crater lies Rikka, a system of six academies known as the Asterisk. Ayato Amagiri enters the Asterisk as a transfer student hoping to compete in a special battle event known as the Festa. However, he quickly finds himself on the bad side of one of the strongest fighters around—the beautiful but fiery Julis-Alexa von Riessfeld. To stand against her he'll have to rely on his own sword-wielding ability, but when the tables turn, will they be able to team up to take down the competition? 
(Source: Anime News Network)

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