Beware the Labyrinth!.Akuto, Korone, Hiroshi, and Eiko go to the school's underground labyrinth to find the spot on the map. They encounter a cloaked being who tries to stop them with swarms of bats, but is easily defeated. Akuto digs up a plush recording device buried under a tombstone that guides them to an abandoned research facility, where they are attacked by an armored statue. Inside the statue, Eiko finds a screen that points to an underground shrine behind a cavern hot spring. Meanwhile, Junko, Kena, and Fujiko make their way to the labyrinth. Junko, who fell underground into the hot spring, tells Akuto that Eiko is actually a government spy. A savage wolf comes after them, but they are saved when Kena and Fujiko arrive. Eiko, in tears after seeing Akuto protect Junko over her, leaves after giving him a key from the shrine. When Fujiko activates the key, it transports them to the headquarters of the student council, who were responsible for the attacks. It is revealed that the headquarters is really the base of the Demon King. Aiming to uncover what her brother had forgotten, Fujiko uses the items her brother left behind to awaken the treasured dragon beast Peterhausen. The dragon beast reacts to an unknown catalyst (implied to be Kena) and replays a record of the events leading to Fujiko's brother's death, causing Fujiko to collapse. An enraged Akuto confronts Peterhausen, soon becoming his new master, despite his wishes. After that the student council president kisses him as a reward for finding the treasure first.