Tokyo police have arrested the suspected head of one of Japan ’s largest tokuryu organised crime groups after a year-long manhunt, but analysts have warned that such gangs are typically resilient and can operate without their leaders. Horaki Obata, 40, was arrested on Monday on the island of Amami in Kagoshima prefecture in southern Japan following a tip-off, police said. Obata is accused of leading Natural, a tokuryu that scouts women on the streets of Tokyo for the sex industry. He has denied the charges against him and chosen to remain silent, according to a report by Fuji News Network. AdvertisementShort for tokumei ryudo, or anonymous and fluid, tokuryu are a relatively recent phenomenon in Japan’s underworld.