Subway : Enemy of the Dimensional Tunnel Subway : Enemy of the Dimensional Tunnel is the seventh episode of " " . Story Detail . Prologue . The episode opens with an extremely brief recap of the final moments ; Bismark dissolves the creatures , and the ground collapses beneath Ai , Yu , Lisa and Chobi . All aboard ! The group quickly recovers , marveling over how the sand was soft enough to save them from the fall . Below the ground , there is a second desert , but this one does not sport the pillars of fire seen above the ground . The group is surprised to find Kaze has fallen down here as well . At that moment , Chobi ' s alarm sounds , and he races off into the distance , claiming a station can be found down here . The group decides to return to the subway , and invite Kaze to come with them . As Lisa touches his hand , he seems shocked , and the scene suddenly cuts to a black and white shot of Kaze and an unidentified girl . Kaze claims " Everything will end in the next fight . " When Kaze opens his eyes , he realizes Yu has led him to board the subway , with the departure bell tolling in the distance . Just as he turns to leave , the door slams such in his face , forcing him to remain on board . As the subway leaves the station , we catch a glimpse of someone watching the group from the next carriage . Friends and foes . Ai and Yu notice the girl watching them , and enthusiastically chase her , believing she might lead them to the Earl . Lisa chases the children , warning that she may work for the Earl . Lisa yells that the girl is not human , causing all four to come to a stop . Yu greets her , as she shyly hides her face from view . As she steps out into the open , Ai claims she looks human enough . They share an awkward moment of tension , before Chobi grabs Ai ' s hair once more . The girl introduces herself as Lou Lupus , or Lou for short , and she quickly overcomes her shyness . After she explains that she has been traveling the Innerworld for some time , the group invite her to join them , noting it would be helpful to have someone with her knowledge with them . She agrees , but warns them of her " true identity " . Venturing to the front of the train , the children discover that the train was built by Cid , after discovering his mark in the driver ' s carriage . Suddenly the train seems to panic , and picks up speed . Suddenly a massive claw appears behind the train , quickly gaining on it . Omega . Lou explains that Omega was torn to pieces a while ago , and what is chasing them is Omega ' s nail . She goes on to describe how Omega destroyed her world , and everything she loved . She claims that despite the destruction of the beast , Omega still lives , though she is unsure how . As the back carriage breaks away , the group comes face to face with Omega , and share a moment of awe and panic over its shear destructive power . After remembering the destruction of her world , Lou requests a mirror . PoshePocket obliges , producing a mirror easily taller then Lou , and several times larger then itself . Lou stares at her reflection for a moment , when suddenly her eyes begin to glow , and she transforms into a werewolf . Taking her place atop the subway , she releases a huge energy blast at Omega . Kaze , seeing this , remembers he ' s seen a light similar to this before , revealing the girl from his memory to be someone named ' Aura ' . It is revealed that Lou ' s attack has no effect on Omega , whatsoever . It shrugs her off with an energy blast , sending her tumbling into the unknown . The others question Kaze as to why he let her fight alone , with Lisa going as far as to claim that though Lou was a werewolf , she was more human them him . Inspired by this , Kaze primes the Magun , and prepares to fire . The group watches in awe as Ifrit charges at Omega , but quickly panic when Ifrit ' s first attack seems to have no effect . Kaze calms them , telling them Ifrit will never lose , regardless of who he is fighting . This is confirmed when Ifrit charges in , using itself as a final attack , causing Omega to shatter . Epilogue . As the group recovers , they notice the final carriage returning , with Lou inside . After noting the Kaze is once more missing , Ai wonders if they will meet again , but Yu claims that Kaze will return , like he always does . The episode closes with Lou mentioning that despite everything , Omega has not been destroyed , and will return . Soil . Kaze reveals another Soil combination in this episode : The grinding teeth of incandescence / The flaming hot fang - Cardinal Red The gale of red lotus flowers / The deep blood of the hurricane - Dark Crimson The strength of steel - Burnt Sienna This summons Ifrit , whose flames can stop anything in its tracks .