Oudo Miyakonojou is a senior of Class 13 and is a member of the Flask Plan's Thirteen Party. Oudo is the chief antagonist of the Flask Plan Arc.  Between the ages of six and twelve, Oudo lived alone on the streets. By that point, he had already started considering himself a king. Oudo abandoned his parents because he was worried what they would do they found out about his Abnormality. He lived on the streets for seven years, looked after by the local police, trying to master his ability and not let it take control of him. He thought of mastering his ability as a test to see if he was capable of being king. At the end of those seven years, he was chosen as a representative to speak to the freshmen body of the middle school he was attending. Though he meant to tell the students to live life to the fullest, the first words that came out of his mouth was the order to bow before him. Oudo realized that in seven years, he had never once gained control of his ability; instead, he was the one being controlled. After three years, Oudo enrolled in Hakoniwa Academy. There isn't a soul alive who knows what he did in those three years. As a part of the Flask Plan, Oudo was paired with Maguro Kurokami, who was fascinated by Oudo's abilities. Sometime after Maguro left the Flask Plan, Oudo approached Mizou Yukuhashi, and ordered his fellow student to read his mind. Because Oudo's Abnormality cancelled out Yukuhashi's, the two became partners from then onwards.   ~!Ten years later, Oudo and Yukuhashi work in the energy development department of the Flask Plan. He can no longer use his Abnormality.!~  (Source: Medaka Box Wiki)

Kurokami Medaka, a first year, is elected as Student Council President, and the first thing she does is establish a suggestion box, later dubbed by students the "Medaka Box". Medaka encourages students to submit any problem to the box without hesitation and promises to take on any issue from anyone. 
 
Since Medaka won the Student Council elections with a staggering 98% of the vote, she ends up as the Council's only member. She asks her childhood friend, Hitoyoshi Zenkichi, for help and he grudgingly agrees, becoming the Student Council's lowest ranking member. Soon Medaka recruits two more people to the Student Council, the former judo club member Akune Kouki as secretary and the current swim club member Kikaijima Mogana, on loan for 300 yen a day, as treasurer. 
 
Now the Student Council members spend their days solving the problems submitted through the Medaka Box, whether they be hooligans in clubs where they don't belong, girls who need help writing love letters or people who've lost their pets, gradually earning the respect and admiration of the entire school. 
 
Included chapters: 
Volume 15 contains the gaiden "Good Loser Kumagawa" (グッドルーザー球磨川); Jump NEXT (2011/12/26) 
Volume 22 contains the gaiden "Good Loser Kumagawa Final" (完結編).

When newly elected Student Council President Medaka Kurokami institutes her idea for a suggestion box where people can submit problems that need to be solved, she's expecting things like rescuing lost puppies and giving advice. What she and her best friend Zenkichi find instead, however, are the first hints of an unbelievable secret, and their school, Hakoniwa Academy, and Medaka herself are somehow at the very center of the growing maelstrom! As what seemed like an innocent past time turns into a dangerous game, Medaka and her recruits to the Student Council discover new depths to both themselves and their own unexpected abilities. And then things get really out of control! 
(Source: Sentai Filmworks)

What started as a simple assistance program has escalated insanely out of control, and now Medaka Kurokami finds herself exposed as something far more than human. But that's only the beginning of a new series of shocking revelations that lead towards a dark secret plan that not even the unbelievable power of her War God Mode may be able to withstand. Still, Medaka's proving to be good at thinking outside of the box, and if she needs the full backing of every hidden resource of the Student Council to meet the challenge, then that's what she's going to get. Even the Abnormal ones! 
(Source: Sentai Filmworks) 
 
Note: Episode 12, titled "Seitokai wo Shikei Shikkou Suru", is part 4 of the "Good Loser Kumagawa" series.

The Final entry in the 'Good Loser Kumagawa' series of Medaka Box side-stories
 
Notes: 
- Final part of the "Good Loser Kumagawa" series.
- After its initial premier in the Summer 2013 Issue of Jump NEXT, it was included in Volume 22 of Medaka Box.