In the year 2036, a company known as 'GAZAHOD Enterprise' creates an annual event known as the 'Itanayagi Battle Royale'. The city's districts are split up into their own separate Battle Royales within enclosed stadiums, enticing people from all over Japan to participate in the event. The chosen participants compete for a prize rumored to grant any desire they wished. Who will win?

In an alternate universe, dangerous creatures known as 'Seraphics' run rampant across galaxies. Born from the light, a hero arises to take on these formidable monsters. On the planet 'Earth', it finds a host capable of using its powers to the fullest. Suddenly tasked with this heavy burden, Reiji Shinomiya must learn what it means to be the universe's Vanguard.