Subsequently, he was involved in many other fighters manufactured by Mitsubishi, including the Mitsubishi J2M Raiden (Thunderbolt) and the Mitsubishi A7M Reppu (Strong Gale).
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Since 1940 was the Japanese year 2600, the new fighter was named as "Model 00" or "Zero" or A6M Zero, in Japan also known as the "Rei-sen" (literally meaning "zero fight," shortened for Model zero fighter airplane).
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He first built the successful Mitsubishi A5M (allied codename "Claude") before he and his team at Mitsubishi were asked, in 1937, to design Prototype 12 (corresponding to the 12th year of the Showa era).