Much of the tension in this episode involves the boys being pressured to sign documents that would lead to their expulsion. As noted in community discussions on Reddit , the power of "paper" in the series often manifests as official documents—like resignation letters—that the authorities use to manipulate the students.
Gakuto and Kiyoshi use scraps of paper to exchange secret plans regarding the purchase of a limited-edition Guan Yu figurine. This communication is vital because they are under constant surveillance by the Council. Prison School Episode 5
The episode, titled "The School's Number One Traitor," centers on the Underground Student Council's attempt to expel the boys. The specific use of paper appears in these contexts: Much of the tension in this episode involves