FunPlus pushed a new hero into its Fist of the North Star collaboration this week. The app update to version 1.1.782 landed with release notes reading "The crossover event has arrived with a brand-new Hero!" — that hero is Mamiya, an SP-rarity Limited character tied to the ongoing Hokuto Shinken crossover in Sea of Conquest: Pirate War. Community tier lists log her arrival at version 1.1.781, dated September 2, and a fresh in-game gift code, MAMIYA2026SOC, went live around September 5 with a September 18 expiration — three independent points that all place this within the last week, not an old update recycled as news.
What Mamiya adds
Mamiya slots in as a Season 40 SP hero, one tier above the standard roster. Her in-game description frames her as "a female warrior who fights to protect her comrades" and "a true Jack of all trades" who "brings serious Firepower to every fight" — a generalist profile rather than a pure tank or pure nuker, which is a different lane from the crossover's first hero. She's recruited through the crossover's dedicated banner rather than the standard Conch pool, so drop rates on her are concentrated for the duration of the event — the same pattern the game used for earlier limited crossover heroes like Mai and Jenet, where the character isn't guaranteed to return once the event closes.
Where the crossover stands
Mamiya isn't the start of the Fist of the North Star collaboration — she's the second act. Kenshiro launched as the Season 39 SP hero several weeks earlier, backed by the gift code KENSHIRO2026SOC (live August 12–26). Kenshiro built his reputation on a defensive kit: percentage-based damage mitigation that scales, plus damage reflection whenever his ship takes a hit, which pushed him to S+ tier in community rankings almost immediately. With Mamiya now live, captains have two of the anime's leads recruitable in the same event window, and the App Store's own crossover pitch — "Heroes from another world have arrived! Join the successor of Hokuto Shinken" — confirms the collaboration is still actively being expanded rather than wrapped up.
For anyone stacking up their roster around this event, hero recruitment is only half the equation — pairing a new SP hero with the right existing crew still decides most fights, which is exactly the kind of build question our Sharky hero build guide walks through in more depth.
Is Mamiya worth pulling on the crossover banner?
She's positioned as a flexible, firepower-focused SP hero rather than a specialist, which makes her a reasonable pull if your roster is thin on generalists — but treat any claim about her exact tier ranking as provisional until more captains have logged real fight data, since she only went live in the past week.
Will Mamiya or Kenshiro be recruitable after the crossover ends?
Based on how FunPlus has handled earlier limited crossover heroes (Mai, Jenet), there's no confirmed guarantee either character returns to the standard pool once the Fist of the North Star event closes — recruiting during the live window is the safer bet if you want them.
End-game tester, 800+ hours in-game, Diamond rank. Every build is tested under real conditions before publishing. Specializes in min-maxing across genres — MMO tank and healer rotations, ARPG and gacha stat optimization, hero-shooter team comps — with a particular focus on how a meta actually shifts patch to patch, not just what topped the chart last season. Cross-checks every ranking against community consensus before calling anything S-tier.
