Action Duels have become a global sensation, but what is the dark secret behind them that threatens to destroy the world?

Yuzu Hiiragi and her father run a Dueling school that's seen better days. If only they had a star teacher to bring in new students! When a rogue Duelist known as Phantom appears in the city, Yuzu may have found a savior, but Phantom will have to deal with the Leo Corporation's special forces before he can get into any community service!