Parody prison school81

[nephila] Shichishou Shichikin Gokaime Kurai (Prison School)

[Hybrid Jimushitsu (Muronaga Chaashuu)] Hybrid Tsuushin vol.15 (Prison School) [Digital]

Meiko Shiraki fan art

(C88) [Yowatari Kouba (Jet Yowatari)] Boku no Dorei Nikki (Prison School)

(C92) [Unagi no Nedoko (Nakano)] Lanthan (Various)

[Gumbat] 告白 -監獄学園同人誌 (Prison School) [Ongoing?]