Chapter Black Saga: The Final Battle

Koenma tries to persuade Yusuke from fighting Sensui, but he charges into battle anyway, asking Sensui to at least take his life with flash. Yusuke lands a kick and then hits Sensui with a barrage of punches, only for him to move out of the way. Meanwhile, Kuwabara uses his Dimensional Sword to break out of Itsuki's shadow dimension. Just as his friends escape, Sensui impales Yusuke with a single finger, sending Kuwabara and the others into a rage. Hiei unleashes the Dragon of the Darkness Flame and Kurama transforms into his former self. Hiei's dragon pushes Sensui through the portal Itsuki opened. However, in the pseudospace, Sensui's sacred energy passess through the kakkei barrier. Hiei and Kurama, being A class demons, are unable to pass. In order to fight the spirit detective, Kuwabara uses the Dimensional Sword to cut the barrier, fitting right into Sensui's plan.

Sensui transforms into his first battle armor, forcing Hiei to put all his strength in the Dragon of the Darkness Flame. Hiei, Kurama, and Kuwabara unleash their most powerful attacks, but Sensui dodges and counters with elegant kicks, then uses Kurama's rose whip as a weapon.

With them all defeated, Yusuke comes through the barrier, riding on Pu with Koenma. Sensui senses great demon energy radiating from his body, and is amused by the fact that a demon hunter has become the demon. Hiei and Kurama attempt to stop Yusuke from fighting, but he confronts Sensui himself. The two clash energies, then proceed to melee fight, with Sensui gaining the upper hand. Yusuke fires a spirit gun, but it harmlessly curves from the target. Sensui dons a second armor, switching his strategy from defense to offense. As he and Yusuke fight, all of Sensui's personalities begin conversing. The energy they release cause demons to join their fight, forcing Sensui to slay them once more.

The two decide to change locations, and Yusuke is fighting on par with Sensui, neither able to push each other back. Sensui manages to kick Yusuke a good distance, and Yusuke attempts to hide. However, his demon energy gives his location away and they continue to fight. Raizen takes over Yusuke's body and changes his appearance, as well as his power. Sensui is easily overpowered, bleeding from a punch to the face, and being pummeled. Raizen shoots a spirit gun, just as Yusuke begins taking control. Yusuke urges Sensui to move, but Sensui is killed in the blast. Itsuki then reveals that he was to die in a month anyway, and takes his body away.