In the tyrannical N Nation—now an ultra-aged society—both criminals and newly retired seniors are exiled to a grim prison isle known as “Geezer Island.” Legendary ex–special forces operative Genji Sengoku is condemned to join them… but his fearless grandson, Genki, isn’t about to let him rot out there. Determined to save his grandfather, Genki sneaks ashore and, amid his search, uncovers a mysterious girl locked in a briefcase. No sooner does he free her than he’s hunted by the island’s violent inmates. Back on the beach, Genji senses danger and rushes toward the surf—only to witness Genki slipping beneath the waves. “An eye for an eye, a tooth for a tooth.” Cast out by society and driven to the brink by his grandson’s presumed death, Genji ignites a one-man war on Geezer Island. Steel-jawed vengeance meets non-stop action in this unforgettable senior-powered revenge odyssey!