He is the right arm of Utsumi and exaggerated with the Shaft Enterprise Planning 7, and he is a cool person who is not likely to stab. Often, they run all kinds of places on behalf of Utsumi. However, because of the poor finish, the boss was often pointed out.

He was a common sense rather than Utsumi, so he was very rotten for his unpredictable behavior. In the TV version, in a dialogue with Captain Kotoki, a similar type of Utsumi , he said, "You have a boss like me ... that's true disaster." Tokuna also fails to dry Utsumi (Comics, Shin OVA).

In the comics, he always acts together with Utsumi and supports him as much as he can, but as Utsumi's actions go too far, he even thinks of destroying the J9 Griffon himself to reduce the risk. However, Utsumi knew all of this and she destroys the container containing the fake griffon herself. Afterwards, Kurosaki, who has nowhere to go, decides to remain as Utsumi's henchman until the end, but in the end, Utsumi is SSS. When her survivor, Jake, infiltrates the airport for revenge and stabs her Utsumi with a knife, he belatedly shoots Jake. However, Utsumi was fatally wounded and died, and Kurosaki's whereabouts are unknown.

In the TV version, he disguised himself as a member of HSS, a private security company, while leading the Phantom incident, and disappeared with Utsumi in the new OVA.