Four men are assigned to the prison: Juugo, a man who attempted to break out of prison and ended up extending his jail time; Uno, a man who likes to gamble with women; Rokku, a man who likes to get into fights; and Nico, a man who likes anime.
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(Source: Anime News Network)

Episode 1 - Idiots with Numbers!

Episode 2 - The Inmates Are Stupid! The Guards Are Kind of Stupid, Too!

Episode 3 - Another Idiot Has Come!!

Episode 4 - Happy New Year! The New Year's Tournament Is Where We Get Serious!!

Episode 5 - A Fraud and a Hero

Episode 6 - The Booster Episode

Episode 7 - It's a Surprisingly Sad Story

Episode 8 - A Monster and a Gorilla

Episode 9 - You're Empty!!

Episode 10 - A Melancholy Day for the Dog, Monkey, and Pheasant

Episode 11 - We Got Our Rewards

Episode 12 - The Room, the Billiards, the Darts, and Me

Episode 13 - Real Idiot

Episode 14 - Nanbaka Is a Comedy Anime

Episode 15 - Super Hitoshi-kun

Episode 16 - The Traitorous Building 5

Episode 17 - Something Is Breaking

Episode 18 - You Are Weak

Episode 19 - One's Own Freedom

Episode 20 - A Fool

Episode 21 - Awakening Poison

Episode 22 - Washed Away...

Episode 23 - Sound and Words

Episode 24 - Move Forward!

Episode 25 - Sarabaka

Satelight

Tokuma Japan Communications

Nelke Planning

Sony Music Communications

DAX Production

NHN Comico

Crunchyroll

GP MEDIA JAPAN

NANBAKA