* First appearance: Battle 4 * Name revealed: Battle 5 * Martial Arts: Mixes of Karate & Boxing
Tsukuba is an upperclassman at Kenichi's school and a black belt in the Karate club. His style of martial arts is sport karate, which combines boxing and karate techniques. He is quite a strong fighter, as "he can take on two people from the Karate club at once, can break rocks with his bare hands, and break bats with a single kick," said by Kenichi during his mental meltdown. He was the referee for Kenichi's fight against Daimonji and quickly wanted to test Kenichi's skills after his win. Though he easily defeats Kenichi, he is not satisfied with his victory after he finds bruises on himself after his fight with him. When he later fights Kenichi the second time, Kenichi wins rather easily by using one of sport karate's fundamental weaknesses.
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