GTO Paradise Lost Vol. 16 (Kodansha, 2021)

Inmate Onizuka is out for revenge-with his new friends, he'll pay the warden back 1000 fold for his crimes! After clearing round one of the Wangan Death match tournament that pits all the toughest inmates against each other, Onizuka sneaks into the infirmary to meet the Behemoth's brother… only to get caught and sent to the supermax wing. Luckily, two friends come to his rescue in his time of need…! Meanwhile, the plot thickens in the ""Onizuka in the Celebrity Classroom"" storyline. His mission: save Nana from Araragi's cult!