Four Leaf (四つ葉と! Yotsuba to!) is the 5th chapter of the Prison School manga, serialised in Weekly Young Magazine on March 7th 2011. It was published in tankobon format as the fifth chapter of Volume 1 on June 6th, 2011.


While Kiyoshi sees Chiyo and starts to worry about her opinion of him after the peeping incident, Meiko announces that the barricade work is completed and the boys will be transferred to a new penal assignment. Hana Midorikawa, USC Secretary and outwardly kind person is then placed on guard duty. Hana orders the boys to collect four leaf clovers in the school grounds to be sold by a shop to raise charity money for the disadvantaged.The boys begin slacking off and peeking at senior students playing PE in the sports ground.When Hana sees Shingo without any clovers she karate-kicks him in the head and knocks him out cold. Meiko promtly reveals that Hana is the fourth-best karate champion in the inter-high championships.

Later during the penal labour slot, the boys begin perving at the senior students playing sports in the sports track near the school forest. When Hana sees Shingo without any clovers, he karate kicks him in the head and knock him out cold. When the boys deliver a batch of four leaf clovers containing three leaf clovers, she viciously beats them bloody. The boys are further displeased by her modest use of underlayers. Chiyo is in the Go club with Mayumi where most of the girls think getting rid of the boys is a good idea. She says quietly that boys who like sumo (like Kiyoshi) can't be bad. When Kiyoshi climbs up a tree to return a crowling to its nest, he sees Chiyo in the third floor window opposite the tree branch, to his shock.



  • The title of the chapter is a cultural reference to the comedy manga series Yotsuba To!.


Prison School by Akira Hiramoto
Volume 1:
Volume 2:
Volume 3:
Volume 4:
Volume 5:
Volume 6:
Volume 7:
Volume 8:
Volume 9:
Volume 10:
Volume 11:
Volume 12:
Volume 13:
Volume 14:
Volume 15:
Volume 16:
Volume 17:
Volume 18:
Volume 19:
Volume 20:
Volume 21:
Volume 22:
Volume 23:
Not in Volumes:
Non-Canon Chapters
Fukukaichou Gambaru:
Anime Promotion:
Other Series:
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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