Hattori was one of the senior members of the karate club, until Masaru defeated the whole club single-handed, leading to its disbanding. To add to his anger, Masaru nicknames him "Umaibou" (a 10-yen snack). Bent on extracting his revenge, he repeatedly tries (and fails) to defeat Masaru in combat. He is normally seen in casual clothes rather than the school uniform, even though he is supposed to be a student.

Okometsubu Fujiyama has recently transferred over to a new school, Wakame High School. His goal is to make 100 friends--until he meets the extremely wierd Masaru Hananakajima. Masaru is a martial artist whose specialty is the "Sexy Commando" form of martial art. Masaru forms a club based on this art, including Fujiyama, who he nicknames Fuumin, in the club. The club becomes full of strange, yet wacky people. Aliens, moustaches, and cute fuzzy animals are encountered as the club moves along and gets steadily more popular.
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(Source: Anime News Network)

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