Kaizer

 is the leader of 24's Night Gaunts, an underground criminal organization recognized as one of the strongest in Japan.

As one of those seeking the "King's Inheritance," he is one of 24's agents in Aitou Academy. He is a music teacher under the name Joji Kaeda.

Prelude to the Final Battle
After the battle against the Trumps concludes, things at Aitou Academy are peaceful. However, that peace is shattered when 24 joins forces with the Transplant Connection. Seeking to cause chaos, TPC agent J. T. Sizzler attacked the academy during a cultural festival. At the time of the attack, Kaizer was speaking to Rin Oldman, who was also attending the festival.

Enraged by the attempt on his students' lives, Jesus launches an assault on 24's base. Mamoru and Tate are dispatched by Tatsumi Daiba to assist him, and the attack ends with 24's permanent destruction. Kaizer can be seen in a helicopter in one panel; while UDDUP does not mention this, Kaizer loses his life during the attack after being fatally wounded by Sizzler.

Other Appearances
Kaizer is a major character in JESUS Sajin Kouro, which elaborates on the conflict between Jesus and 24, and elaborates on the "King's Inheritance." Shortly after Ashe enrolls at the academy to avenge her mentor Manami Minou's death, which she believed was caused by Jesus, Kaizer and Ragi attack both of them to claim Jesus's life and take the "King's Inheritance" for themselves.

Kaizer and Ragi both become undercover teachers at Aitou Academy, in music and English respectively. They engage in fights against Jesus and Ashe, but later find themselves cooperating with those very same people when the school is invaded by a strange super-soldier.

During the cultural festival, Akari Okonogi invites him to play the piano for the event. Later, Kaizer is speaking to Rin Oldman inside the academy when gunshots and explosions are heard on the festival grounds. While the stunt successfully wounds Jesus, the perpetrator J. T. Sizzler shoots Akari in the chest to awaken Hina's rage, which angers Kaizer as well.

When Jesus leads an assault on 24's headquarters, Kaizer leads the Night Gaunts in its defense. However, Jesus's former student, Tariq Assard, joined forces with Hina to take their own revenge on the TPC. They destroy the Night Gaunts' warehouse, causing Rin Oldman to deem the group a failure, much to Kaizer's anger.

Later, Kaizer bursts through the window during Jesus and Sizzler's showdown. While he initially came to back up Sizzler, Sizzler betrays him and shoots him in the back several times, mortally wounding him. Jesus takes advantage of the distraction to injure the otherwise-impervious Sizzler's eyes. Before Sizzler can retaliate, Kaizer puts him in a chokehold and pulls out the pin on a grenade. After stuffing it into Sizzler's mouth, Kaizer throws himself and Sizzler out the window, leaving the words "School was a more interesting place than I thought... See ya, Jesus." As they fall, the grenade detonates, killing Kaizer and Sizzler as Jesus watches on.