Invictus (インビクタス Inbikutasu) is the 123th chapter of the Prison School manga, serialised in Weekly Young Magazine on January 20th, 2014 and published in tankobon format in Volume 13 on May 2nd, 2014.


Mari return to the prison after her talk with Kate, and seems totally broken. She walks with difficulty and then collapse in a corner of the room with a dejected style, her arms, support by her knees, hiding her face while her eyes shut. Kiyoshi, seeing the broken spirit of the president, think it was a slow-acting poison after all and that the SG must have made a mistake with the snake and begin to hysterickly scream and call for a doctor, ignoring Meiko's comment that it maybe not poison. Kiyoshi begs Mari to suck out the poison, but she shove him away and then fell inscoucious. Kiyoshi decide that if he want to die, he want to have breasts in his hands : he run to the President but falls a few Centimeter before her. He approach his hand, trying to touch her breasts as he cry but the President catch his hand without moving her body: She declare that they must break out as she raise her head with a determined face.

Joe states to Mitsuko that they wasn't any actual BL between him and Gakuto. Mitsuko think to apologize, but Joe find her Manga funny and plead again to read the continuation, but Mitsuko can't write BL anymore, so Joe give him trail. Kate is certainly sure to win, thinking the USG are bird in a cage.



  • The chapter title is a cultural reference to American sports drama Invictus.
  • The chapter cover was digitally produced by Akira Hiramoto in Manga Studio 4.0, and the visual process was uploaded in a screen-capture YouTube video on the Yanmaga channel.


Prison School by Akira Hiramoto
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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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