Nobody Knows (誰も知らない Dare mo Shiranai) is the 162th chapter of the Prison School manga, serialised in Weekly Young Magazine on December 22nd, 2014 and published in tankobon format in Volume 17 on June 5th, 2015.


Sitting on Kate, Mari tells her that she want the most if she is honest, revealing her chest in the process. Kate denies that she is not interested and threatens Mari with another bite. When Mari approaches, Kate bites her chest. Kate then proceed to denounce Mari's background and proclaim that she work hard to take back Mari stole from her. Mari apologises for her misunderstanding and state that Kate want to her in fact and praise her true hard working, but adds that she can never became her as kate remembers his time to dress up like Mari. Mari began suddently to passionately embraces Kate, while telling her to not be afraid.

At the same time, Risa is enrage at Gakuto as she thinks he call her "ugly shinai" and try to break into the Boys's chamber. Shingo insult her again involuntary when he tried to barricade the door, that prom Risa to want to beat them all. She found an iron pipe to the Boys'horror and break the barricade.



  • The chapter title is a cultural reference to Japanese urban drama film Nobody Knows.


Prison School by Akira Hiramoto
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Non-Canon Chapters
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Other Series:
  • Fukukaichou Gambaru
  • Agonashi Gen to Ore Monogatari
  • Me and The Devil Blues
  • Yarisugi Companion to Atashi Monogatari
  • Sono Tomodachi no Gimon Ari
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