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Summary Koichiro Ohta, more commonly known as "Coach" to his students, is the main instructor of the Top Squadron and in charge of training the young members of the squadron how to fight and effectively pilot the RX-7 Machine Weapons. Ohta is also the head director of the "Gunbuster" project, a project whose goal is to create a weapon capable of effectively defeating space monsters.
Ohta suffers from a sickness known as "Space Radiation Sickness" which he contracted during his time in a space fleet. The disease is slowly but surely killing him.
History Ohta was a member of the space fleet that was commanded by Admiral Takaya, Noriko Takaya's father. During one of their first expiditions beyond the limits of the solar system, the fleet came under attack by space monsters. There were heavy casualties and only a few survivors. However, Admiral Takaya was able to carry Ohta to one of the remaining lifeboats, saving Ohta's life. The Admiral, however, decided to stay behind and go down with his ship. Ohta never forgot this and works so hard on Gunbuster and training Noriko in order to exact his revenge on the space monsters that killed his leader and mentor.