After the failure I♥B experienced in their latest live performance, they've dedicated themselves to practicing. When a senior IChu unit, Lancelot, appears before them, I♥B performs a song perfectly at their request, but the word that comes out of Issei's mouth is one they never expected.
Amid the mysteries of the labyrinthos...
...أمام غموض المتاهات
Inmitten der Mysterien, die in den
Tiefen dieser Labyrinthe lauern,
Y en lo más profundo de este laberinto
Tu es à présent perdu
dans ce labyrinthe d’ésotérisme
Tra i misteri profondi del labyrinthos...
Você, no meio dos
mistérios dos labirintos...
Среди загадок
бесконечного лабиринта