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Mark is a polar bear cub. He is the prison pet of inmate Shūji Orinaka, assigned as part of the prison's animal therapy program. Mark is almost always seen grabbing onto the front of the prisoner's vest, which Orinaka doesn't mind since the bear acts as an additional weight when he is doing his boxing training. There is a deep bond between the two, although Orinaka became annoyed at Mark when the latter's following of him ruined his plan to escape from the prison.

Foiling a prison escapeEdit

Main article: The Imprisoned Turnabout

Mark blowing Orinaka's cover.

In March 2019, during a show performed by the Berry Big Circus, Orinaka left Mark in the care of Frank Sahwit, intending on escaping prison. However, while Sahwit was applying mud packs to Mark, the bear ran away to be with his owner. In chasing after the bear, Sahwit witnessed Kuro, the dog owned by Ryōken Hōinbō, apparently killing Manosuke Naitō. Meanwhile, Mark caught up to Orinaka and leaped onto him. This incident was caught on a security camera, and was later initially mistaken for Kuro attacking Naitō.

Later, during the investigation into Naitō's murder, Orinaka once again attempted to escape by disguising himself as one of the prison guards, having stolen a uniform beforehand. However, Mark latched onto him again, blowing his cover.


Mark adores Orinaka, and so is frequently seen latched onto the front of his torso. He loves to be with Orinaka to the point of seemingly not wanting him to escape prison, having twice foiled his attempts to do so.


  • Mark's English name in the unofficial fan translation of Gyakuten Kenji 2 is "Rocky", which is likely a reference to the Rocky film series, owing to Orinaka's boxing gimmick.

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