Shiyuukaijī (臭蓋爺, Shiyuukaijii)[1] is the oldest prisoner at Smelly Lid Prison.


Shiyuukaijī is an elderly man with a large nose and many missing teeth. He wears a standard prison uniform along with a small hat.


Shiyuukaijī, being the oldest and longest held prisoner, takes great pleasure in watching new prisoners suffer. However, like the other prisoners he too has a great fear of Puri-puri Prisoner.


Human Monster SagaEdit

Super Fight ArcEdit

Nyan broke into Smelly Lid Prison searching for Puri-puri Prisoner. Shiyuukaijī and the other prisoners question the monsters motives.[2]

Appearances in Other MediaEdit



When Speed-o'-Sound Sonic entered the prison and began examining the structure, Shiyuukaijī warned him there is no escape, no morals and no salvation in prison. He gleefully states that he saw many prisoners lose their minds and couldn't wait for the same thing happening to Sonic. After Sonic defeated a prisoner and caused a commotion, which woke up their boss, Shiyuukaijī explained the situation and admitted he is afraid of their boss.[3]


  • (To Sonic) "That proud face will contort when it hits bottom!! Just imaginin' it makes me droolin'! HEE HEE!"


  1. 1.0 1.1 1.2 One-Punch Man Encyclopedia; One-Punch Man: Hero Perfection, page 184
  2. One-Punch Man Manga; Chapter 66, page 15
  3. One-Punch Man Omake; Prison