Aoba and Mink head further into Oval Tower and find data on Toue's experiments. Aoba finds out that Mink means to kill Toue, but before he can do anything, they end up being chased and have to seperate. Suddenly, Sei appears in front of Aoba. He tells Aoba that he's been waiting to meet him... but who is he?
You didn't know about your 
older twin brother, Sei-san?
ألم تعلم بأنّ لك أخاً توأم أكبر منك يدعى (سِيْ)-سان؟
Du wusstest nichts von deinem
Zwillingsbruder Sei-san?
¿No sabías lo de tu 
hermano mellizo, Sei-san?
¿No sabías lo de tu 
hermano mellizo, Sei-san?
Tu ignorais l’existence…
Você não tinha conhecimento 
do Sei, seu irmão gêmeo?