Mari, Takumi, and Keitaro begin looking for Mari’s schoolmate Masato Kusaka.

Yuji has decided not to attack humans. Naoya is still trying to figure out what he wants. Yuka is trying to figure out Naoya. Naoya decides to be human and date. He drags Yuka out on a practice date.

Takumi, Mari, and Keitaro find Masato. As he and Takumi have a fencing battle, Mari’s former schoolmates are attacked by an Orphenoch. They go to rescue them. Masato follows and transforms using the Kaixa belt. He defeats the two Orphnochs .

Having accidentally found out about Yuji, Masato announced a truce as they fought Saeko and another Orphenoch that had come to kill them. Realizing the fact Yuji did not know of Faiz's true identity, Masato hatched a plan to use that against Yuji as he learned about Lucky Clover.

Smart Brain recovered Faiz and Kaixa as Kusaka was captured. Mari and others sneaked into Smart Brain to save him. While escaping from Takumi, both of them discovered the entrance to the underground Ryusei School. Over there they stumble into a startling discovery.

Kyouji was disappointed about the loss of the belts as he looks for another Lucky Clover candidate. Masato reminds Takumi to keep quiet about what they saw at the school as they met the Ryuseiji later. On the other hand, the remaining Ryuseiji fought over who should keep the Delta belt. A girl appeared at Keitaro as she offered to work part-time. Delta appeared.

Members of the Ryusei School are trying to find the Delta belt and are arguing over it at the same time. Itsuro of Lucky Clover continues to try to kill Yuji. As they are fighting, they run into Keitaro and Saya. Keitaro encourages Saya to run and soon Delta appears on the scene. Everyone thinks that Aki has the Delta belt. Kyosuke and Ken kidnap Mari to lure out Aki, who continues his murderous rampage as an Orphenoch. Aki kills Kyosuke and Ken as Takumi and Masato arrive on the scene to save Mari. Delta arrives on the scene.