Subaru and Itsuki face off against Arc Ruler Erde in a two-on-one battle. But who exactly is this guy? And why is he so certain of victory, claiming that he knows all about the pair?
Something they couldn't 
let the rest of us see.
شيء لم يُرِد أن يدع بقيّتنا نراه
Etwas, das er uns anderen
nicht sagen kann.
Algo que no puede permitir que veamos.
Algo que no puede permitir que veamos.
Sûrement
quelque chose d’inavouable.
Qualcosa che noi altri
 non avremmo dovuto vedere.
Alguma coisa que não poderia
deixar o resto de nós vermos.
Нечто, что не должны увидеть остальные.