To set things straight with the Sword of Logos, Touma decides to break into Southern Base to meet their leader, the elusive Master Logos. Little does he know that Storius also intends to invade it to claim the organization's forbidden tome. In the chaos of battle, Touma ends up acquiring the tome, which transforms into the unstable Primitive Dragon Wonder Ride Book. Possessed by its overwhelming power, a feral Touma viciously defeats Legeiel in combat before collapsing from exhaustion.