In a flashback, Hiroshi learns he is destined to become a hero. In the present time, Korone leaves after saying she has failed in her mission, which she hints as being her failure to seduce and manipulate Akuto. Yukiko Miwa, Hiroshi's younger sister, goes to Akuto to verify if he is truly the Demon King. After both Akuto and Hiroshi deny their destinies, Yukiko runs off in tears. Hiroshi later explains that beneath the legendary lake is a shrine inside a cave, where there is a sword in the stone. A mysterious man, known as Mr. X, awakens a mana-absorbing sea cucumber beast from the lake. Mr. X captures Yukiko, but Hiroshi and Kena try to fight back. However, Hiroshi is pummeled into the lake and Kena is captured. Akuto and Junko rescue Yukiko and Kena, but Mr. X sends the beast to destroy the village on the island, and then overwhelms Akuto with anti-magic attacks. After Akuto understands the secret behind Mr. X's attacks, Mr. X turns his attention to Junko, Yoriko, and Kena. Luckily, Korone returns just in time to stop Mr. X's attack. Meanwhile, Hiroshi goes to the shrine, pulls the sword out of the stone, and gains the powers of a hero. The sword gives Hiroshi the name Brave, and he uses a plasma-like attack to eradicate the beast. Korone admits that she tried to seduce Akuto in order to teach him how to develop an intimate relationship with someone of status (like Junko), and she previously believed she had failed because it seemed like Akuto had fallen for Kena.