Hajime, Jyugo, Uno, and Nico head to Building 5 to find out about Rock and Yamato.
Jyugo and the others fall into a trap and end up in level 1 underground cell.
There, they find the captured Upa and Liang.
Meanwhile, Hajime is captured by Inori and is escorted to the underground cell where Samon, covered in injuries, is restrained.
Samon reveals who’s behind the incident.
It is no other than Enki Gokuu, the former Building 5 supervisor who became a criminal causing havoc in Nanba Prison in the past. He is also Samon’s brother.
He's the one who made this former 
underground cell, after all.
فهو من أعدّ هذه الزّنزانة التّحأرضيّة 
.السّابقة قبل كلّ شيء
Schließlich war er derjenige, der diesen
alten Untergrundkerker ausgehoben hat.
Al fin y al cabo, él construyó
este antiguo calabozo.
Al fin y al cabo, él construyó
este antiguo calabozo.
Faut dire que c’est lui
qui a construit ce cachot.
Dopotutto è stato lui a costruire
queste celle sotterranee.
Foi ele que criou essas 
celas subterrâneas, afinal.
Это ведь он создал эти подземные камеры.