Taki commands the Special Security Force, a government unit authorized to employ lethal force beyond standard legal limits against escalating terrorist threats. He directs all operations and personnel, issuing orders to agents like Angel and Raiden.

His strategic leadership targets the communist group Red May, though he later uncovers deeper complexities. Discovering evidence implicating government officials in terrorism fuels his skepticism, particularly towards Governor Maisaka. This distrust leads him to withhold cooperation, refusing cybernetic enhancements for his agents proposed by Ministry of Defense scientist Ichihara.

Taki authorizes and oversees the extreme interrogation of Red May leader Tachihara, resulting in severe physical damage to the captive. His investigation into wider conspiracies culminates in a direct confrontation with Governor Maisaka. During this encounter, Taki sustains critical injuries but successfully plants a disguised explosive device near Maisaka. Despite his wounds, he escapes before the detonation kills Maisaka and his associate Togawa. Taki later succumbs to his injuries.

Throughout, Taki maintains a pragmatic focus on neutralizing national security threats, prioritizing this objective above institutional loyalties or procedural constraints when they conflict. His actions consistently reflect a willingness to operate independently upon confirming corruption within established power structures.