A sumo wrestler the size of a bear, he's dressed up in the standard sumo wrappings around the waist. He's the final challenge of the Earth Tournament. Before challenging officially battling him, Hagane-kyuu seems to have noticed the brush techniques Kuni used, and challenges Kuni to face him without the "bug in his pocket." Kuni accepts the challenge, fighting the titanic sumo wrestler in mortal to mortal combat. Defeating him nets Kuni an Earth medal (which the people running the tournament have to pry from Hagane's hands) and a ton of yen.
back step: leaps backwards to avoid an attack. Doesn't do damage itself. Usually chains into palm strike.
side step: leaps to either side to avoid an attack. Doesn't do damage itself. Usually chains into palm strike.
palm strike: quickly thrust a palm forward. Deals a quarter unit of damage, used to disorient and chain into another attack.
palm strike combo: Usually does this when Kuni's a fair distance from him. He contracts his arms to his side before rapidly thrusting his palms in front of him, alternating between left and right, while rushing the half the length of the arena in a straight line. Deals half a unit of damage.
kick: quickly swings his leg in front of him. Deals a quarter unit of damage. Usually chains into foot slam.
foot slam: lifts his leg upwards before slamming it down in front of him. Deals half a unit of damage.
stomp combo: begins by stomping three times, to his left, right, front, before graciously leaping into the air delivering three more stomps in succession. Can travel a quarter of the arena's length with one jump. First three stomps deal half a unit of damage. Leaping stomp deal a unit of damage.
circle toss: stretches his arms outwards and clasps both hands in front of him. If attack connects with Kuni, he'll spin the arm holding him once before tossing him half the arena's length away. Impact post throw deals half a unit of damage, however it is likely Kuni'll end up in the hot coals past the arena's borders and get burned.
charging grapple: usually does this when Kuni's a fair distance from him. Places his hands at his sides before rushing half the arena's length in a straight line. If he makes contact with Kuni, he grabs him and tosses him a quarter of the arena's length. Impact post throw deals half a unit of damage, but it's likely that Kuni will end up in the hot coals past the arena's borders and get burned.
circle dodge: quickly leaps to Kuni's side and behind. Doesn't deal damage itself.
Strategy: The arena the fight takes place in is a single circle of wooded floor surrounded by hot coals. Hagane-kyuu is quick in palm strike and kicking, but he has obvious tells toward his more dangerous attacks. However, despite his size, he's fairly quick to recover from his attacks. He's also quick to dodge your attacks if he isn't recovering from one of his attacks. He rarely makes a first move and waits for you to attack and leave yourself open. Hagane doesn't take damage from Kuni's attacks, they just pushing him back. As you probably guessed, the goal is to knock Hagane into the hot coals surrounding the arena. Wait for him to use attacks that result in him traveling across the arena and dodge accordingly. Try to position yourself such that Hagane will end up close to the edge of the arena, then capitalize on their vulnerability to knock him into the hot coals. This results in him alternating between clutching one foot in pain and the other foot in pain until he eventually bounces back into the arena with one third less health. Do this two more times, and Kuni will be victorious.