Hell's Paradise Jigokuraku (Manga) Vol 12 (Mature)

As the powerful ninja Shija flips between wanting to kill and wanting to be Gabimaru, the rest of the survivors fight for their lives! Safety is so close, and all they need to do is overcome this final obstacle and secure their escape. But when the true purpose of the experiments performed on the island is revealed, everything descends into utter chaos. For mature audiences. Viz Media Llc
(W/A) Yuji Kaku