Seguchi Shinobu

Renoma, the boss of Double Dragon Cross, the No. 2 gang in the futuristic city of Tokyo, has been captured. \`\`The defendant, Sasaki Renoma, will be sentenced to 28 years in prison at Gokurakujima Special Class Prison.'' Climb up from the bottom of the worst prison and survive!! “Prisoner Riku” Gaiden begins!!

Born into a world beyond imagination and imprisoned for a crime he never commited, Young Riku's life couldn't sink any lower… or so he thought. Determined to survive no matter the circumstances, Riku now faces the near-impossible task of outliving a prison sentence in Earth's worst penitentiary.

Gengo Matsunaga, known as "The Fire-Eating Bird," Edo's greatest firefighter, retired from firefighting due to a certain incident. He and his wife, Miyuki, were living as impoverished ronin. Suddenly, he received an offer of employment from the Dewa Shinjo Domain—"We want you to save Edo once again as the head of the fire brigade." Determined to protect lives from the numerous "suspicious fires" plaguing Edo, Gengo decides to become a firefighter again. He rebuilds the fire brigade, which is on the verge of collapse and ridiculed as the "Raggedy Firemen's Group," and confronts the raging inferno to protect Edo and lives!!