When the federal government sets up an FBI task-force in Hawaii to investigate recently multiplied gang related violence, Steve firmly rejects any suggestion that this coincides with the return of former Yakuza prince Adam Noshimuri, who dismissed the jailed former Hawaiian Yakuza boss Michelle Shioma's demand to 'find' her children, in witness protection. Next task force member agent Fischer is murdered with wife and child by bombing their new home. Five-0 Task Force teams up with surviving FBI agent Colin McNeal, Honolulu PD and the National Guard to arrest and question all known organized crime members, whch proves Junior's fire baptism, as he was to back up to HPF agents, who are both shot, but he overcomes the fiend. Yet none sings and Shioma's succeeding deputy Brandon Kenzo, who seems to lose no goons while his rivals are decimated, is found innocent. Convinced it's the work of flown-in Japanese hitmen, Steve assigns Adam to head up a special division within the Five-0 Task Force which focuses solely on these Yakuza crimes.
—KGF Vissers