# Title Original airdate
01 "The Demon King is Born!"

"Maō ga Tanjō Shichatta!" (魔王が誕生しちゃった!)

April 3, 2010
Akuto Sai meets Junko Hattori on the train to Constant Magick Academy. The two make a powerful pact to make the world a better place, a pact that will mean death if broken. Upon arrival, Akuto is declared to be a future Demon King, and the entire school begins to fear him. After his introduction in class reaches a zealous climax, a fellow student named Hiroshi Miwa looks up to him, while the rest of the class becomes even more terrified. Eventually, Akuto slips up when he volunteers for "cleaning duty", which is slang in Constant for becoming a "cleaner", an assassin that maintains the school's secrets. This infuriates Junko, who challenges him to a duel that ends with Akuto accidentally destroying the classroom in a magical explosion. His later attempts to reconcile with Junko at her dorm again launch her into a murderous frenzy, resulting in a chase through the woods. There, Akuto runs into Kena Soga mid-fight, and she resolves to protect him for personal, though unspecified reasons. She is unable to do so, and Akuto again ends the fight with another freak explosion. Immediately after, he is greeted by Korone, an "observer".
02 "Strange Surveillance Agent"

"Okashina Kanshiin" (おかしな監視員)

April 10, 2010
Akuto meets with the principal of Constant Academy with Korone, whom the principal ordered to stay with Akuto as a bodyguard and a judge of whether or not he will truly become a Demon King. Akuto meets with Fujiko Eto the following day, who pledges to help him despite his destiny. She later recommends that they meet in secret in the mountains behind the school, and instructs him on how to disable Korone. En route, Akuto and Korone are attacked by a demon dog, an animal mutated by mana. Akuto is able to absorb the creature's mana and return it to a puppy, a feat that astounds Korone. The puppy picks up Kena's scent, whose ability to become invisible is revealed. After deactivating Korone, Akuto rendezvous with Fujiko in the mountains, where she asks him to join the school's Disciplinary Committee to help clear his name. As an emergency way to reconcile with Junko, she also gives him a two-shot magical gun that fires medicinal tablets, which she claims will allow the two people shot by it to understand each others' feelings. On the way back, he is tackled by Kena, still fleeing from the puppy, and is rendered visible (and naked) in clear view of the now-reactivated Korone. In exchange for testifying to Korone that Akuto did not try to molest her, Kena requests his friendship, which he agrees to. At the end, Fujiko is shown contacting Junko, falsely claiming that Akuto had threatened her. Fujiko then enters a secret passage in her room, where she converses with her brother's severed head about her plans for Akuto.
03 "A Slightly Intimidating Senior"

"Chotto Kowai Senpai" (ちょっと怖い先輩)

April 17, 2010
During a late-night soak in the boys' bathhouse, Miwa informs Akuto about the school's underground, and mentions that Junko gained her popularity at the school by fighting this underground. As Fujiko arranges a meeting between Akuto and Junko the following afternoon, Akuto meets with the Student Council with regard to his application for being the Disciplinary Committee's representative. Akuto has to deal with Korone in order to meet with Junko, and decides the only way to ensure she is out of the way is by pulling her tail again, which leads to a misunderstanding until Kena interrupts to dump her rice cooker on Akuto since she was banned from keeping it in her room as a gesture and proof of their friendship. The meeting with Junko turns out to be an ambush by members of the underground, and Akuto swiftly beats them, only for Junko to appear when the dust settles. Mistakening the act as a wrongdoing, she publicly calls Akuto out for punitive justice, and together with a large crowd of students, chase Akuto around the school. Kena intervenes at the last moment before Junko can complete her punitive justice. Junko admits that the situation got out of hand and that she was partly responsible for the misunderstanding that prompted the mob to come after Akuto, only to have the mob call her out for turning back to Akuto's side. Korone saves the situation by showering the angry mob of students in medicated rice.
04 "The Isolation Cell is Fun?"

"Dokubō wa Tanoshii?" (独房は楽しい?)

April 24, 2010
Kena's intervention manages to somehow make Junko and Akuto friends again, but during a class lesson on mana control, he knocks her unconscious again. Mitsuko recommends that he go into the Mental Self-Discipline Chamber, a chamber where people are said to have died. Akuto gets depressed, but for some strange reason, Korone and Kena tag along and he is caught between the two of them. They find a mysterious map and Kena is intrigued, wondering if it is a treasure map. The next day, Kena copies the map and posts it all over the school. It becomes the talk of the whole academy, but Fujiko recognizes something on the map.
05 "Caution! Underground Labyrinth"

"Chika Meikyū ni Goyōjin" (地下迷宮にご用心)

May 1, 2010
Students keep getting hurt as they try to find the treasure on the map Kena put up. Akuto, in his role as Disciplinary Committee member, insists that they give up looking, but a girl named Eiko Teruya suddenly appears and he ends up having to find it himself. Akuto, Korone, and Hiroshi go to the school's underground labyrinth to find the spot on the map, but they find there a treasure once allowed only to a Demon King.
06 "Let's Go to the Beach School!"

"Rinkai Gakkō e Ikō!" (臨海学校へ行こう!)

May 8, 2010
By defending Fujiko, Akuto finds himself in control of the previous Demon Kings's secret treasure: a dragon named Peterhausen. Despite his wishes, his reputation as Demon King grows. Under observation by the government, Akuto is depressed to find out he cannot go to the seaside school. But Korone arranges for him to go by offering to take responsibility for him herself. Akuto is enjoying the beach with Junko and the others, and things with Junko are about to start getting better, but Korone and Kena show up and screw things up in their usual way.
07 "The Legendary Hero Emerges?!"

"Densetsu no Yūsha Arawaru!" (伝説の勇者現る!)

May 15, 2010
The island they had come to is revealed to be Hiroshi's hometown and a legend exists there: when the Demon King revives, a beast would appear, and a hero would appear to defeat it and the Demon King. It was just a legend, but Hiroshi was depressed. That night, his little sister Yukiko appeared and asked which of them was the Demon King. She believed firmly that Hiroshi was the legendary hero, and if there was a Demon King, he could be the hero as well. But when she cries and runs away when Akuto denies it, she is captured by a mysterious man named Mr. X. As they chase after her, a gigantic beast appears!
08 "Eyeing Her Over?"

"Ano Ko ni Goshūshin?" (あの子にご執心?)

May 22, 2010
Hiroshi gets the legendary blade and becomes the hero Brave, but he does not tell anybody his true identity. Meanwhile, Akuto starts to think about Kena more, as he wonders if the hairpiece she wears is something he gave her when she was a child. But Kena herself is as easygoing as ever, still skipping class constantly. Akuto decides to try to persuade her to go to class. Korone later tells a depressed Junko to have a marriage interview with Akuto at her family's home.
09 "Crazy Fuss About an Arranged Marriage"

"Tonda Omiai Sōdō" (とんだお見合い騒動)

May 29, 2010
Without either of their input, it is decided that an arranged marriage meeting is to be held between Junko and Akuto at Iga Village. Junko, who has feelings for Akuto, is unable to tell him, and so invites him to the village for other reasons. Akuto knows nothing of the marriage interview, but feels responsible for the messes he has caused and decides to go with her. That night, Junko readies herself and visits his room, but another misunderstanding occurs. As Akuto flees, he is confronted by Eiko, who tells him that the god Suhara has decided Kena as a threat, and orders the Teruya Family to eliminate her.
10 "Akuto's Great Capital War"

"Akuto no Teito Dai Sensō" (阿九斗の帝都大戦争)

June 5, 2010
Boichiro Yamato, head of CIMO8, saves Kena from being assassinated, but he was only interested in making her, whom he calls the "Law of Identity", his own in order to control the gods. Akuto uses his power as the Demon King to return to the school and faces off with Boichiro, but is wounded as Boichiro's attacks surpass his mana-controlling abilities. Fujiko appears with a horde of monsters, saving the two and going back to Peterhausen. Meanwhile, the government army under Eiko's command arrive outside the school and begins "Operation Battering Ram" to defeat the Demon King.
11 "The Girls' Final Battle"

"Onna-tachi no Saishū Kessen" (女たちの最終決戦)

June 12, 2010
Akuto takes flight with Peaterhausen, having sworn to kill the gods to protect Kena, but the imperial aircraft carrier Black Crane appears and due to the work of 2V, an agent of the Cabinet Intelligence Magick Office, Akuto is flattened by the Black Crane. At the same time, Eiko's troops raid the school to destroy the monsters infesting it but Lily repels them. Eiko uses Junko to protect herself and orders her to take out Lily. Meanwhile in the school, Fujiko is taken aback by Akuto's apparent death, but Kena is convinced Akuto is still alive until she is kidnapped once more by Boichiro.
12 "The Perfect Ending?"

"Oshimai wa Kanpeki?" (おしまいは完璧?)

June 18, 2010
Boichiro has taken Kena to the Suhara Shrine and attempts to make the contract with the Law of Identity, but Akuto appears and the battle begins in the presence of the gods. Akuto at last defeats Boichiro and takes back Kena. He learns that the Demon King was created by the gods to make the contract with the Law of Identity and destroy humanity. Akuto refuses and declares his intent to kill the gods, causing their defense system to activate. Akuto puts his life on the line to battle the gods, and put an end to the story they have created.