Michizō Tachihara is the fifth and final member of the Hunting Dogs special units, operating undercover as a Port Mafia mafioso and Black Lizard battalion leader. Later, he serves as a double spy for the Mafia on Ōgai Mori's orders. He has the ability named Midwinter Memento.
On the surface, Tachihara is an arrogant, impulsive, rash individual, more than willing to solve problems through sheer brute force and his dual guns.