Where can I buy a one-shot manga called 'Prisoner' (written in Katakana)?
The one-shot is titled プリズナー (purizunaa, Prisoner) by Masakazu Ishiguro.



It was serialized in もっと！ (motto!, More!) vol.7, published in August 2014.



It can be bought on Amazon Japan.





*The magazine is on hiatus since the end of 2014 and there doesn't seem any licensed English translation of it.