No.6, book 8
Atsuko Asano et Hinoki Kino2014

I LOVE YOU, SHION. MORE THAN ANYTHING.
Risking everything, Shion and Rat have finally made it to the top floor of the Correctional Facility, where Shion is finally reunited with Safu! But has Shion's rescue attempt come too late? Is the Safu he once knew gone forever? As Rat rushes to find a way out, Shion must make a heartbreaking decision: Leave, saving Rat and himself from capture, or stay, and find another solution? Either way, Shion may lose a friend, or his own life! The tale of No. 6 builds to a climax in its second-to-last volume!
Includes special bonus story!