Tsutomu Kojima (小島勉 Kojima Tsutomu?) is a member of the Earth Defense Class, for which he serves as the advisor and the computer operator. He always does research and carries the Raijin Commander with him. He's the most brilliant student in the class. His cousin, Takako Kojima is a member of the Saurers, though their relation to each other is never really mentioned in either anime.
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