Behind the attack on Chrono and the Federation of International Vanguard Association, Shion battles with another assassin, Valeos. Aiming to destroy Fides, Valeos unleashes the power of the taboo dragon, "Zeroth Dragon".

Kazuma and Kazumi searches for a way to rescue Chrono and the rest from Relics. However, Kazuma gets dragged onto an inescapable ship, and fights against Saori, who swore to have his revenge.