Yūri Katsuki carried all of Japan's hopes on his shoulders to win at the Gran Prix Finale ice skating competition, but suffered a crushing defeat. He returns home to Kyushu and half feels like he wants to retire, and half feels like he wants to continue ice skating. Suddenly the five-time consecutive world championship ice skater Victor Nikiforov appears before him with Yuri Plisetsky, a young Russian figure skater who is already defeating his seniors. Victor and both Yuris take up the challenge on an unprecedented Gran Prix series.

Welcome to Nanba, the world's largest and most impenetrable prison. Locked away in Cell Block 13 are four inmates - pill-popping Nico, burly food-loving Rock, gambling charmer Uno and Jyugo, who was born at Nanba and has made more escapes than any other prisoner there - who provide more than enough trouble for the tough Officer Hajime. Follow them and their numerous adventures within the walls of Nanba.