K.O.Sen

is a Japanese manga created by Katsutoshi Murase. The manga began its run in on December 16, 2007 and ended in 2008 after only 12 chapters due to a lack of reader interest.
Story
3rd year middle schooler Sen Tobishima, who has inherited his late father's red hair and amazingly strong body, fails every class and cannot graduate to high school because he spends all of his time doing stupid stunts. His mother and grandmother have grown tired of his reckless behavior, so for summer break they have sent him to the kick boxing gym of Coach Sakurawada, the main who straigtened out Sen's father years ago. Although he resists staying at first, Sen changes his mind after seeing that only the coach and kick boxing ever truly understood his father.
Characters
Tobishima Family
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Sakurawada Gym
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Others
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