Although seen as a replacement for the A6M Zero-sen carrier-based
fighter, the Mitsubishi J2M Raiden was actually designed as a land-based
naval interceptor optimized for speed rather than maneuverability.
Engine cooling problems for its Mitsubishi Kasai 23 engine and airflow
and flight control issues plagued the Raiden's development, but despite
these production delays, aces Sadaaki Akamatsu Yoshihiro Aoki, Susumu
Ito and Susumu Ishihara all claimed significant scores in the Raiden.
Kawanishi's N1K family of fighters were privately developed by the
manufacturer from the N1K Kyofu floatplane fighter. Again plagued by
structural and engine maladies, the N1K1-J Shiden eventually entered
front line service in time to see considerable action in the doomed
defense of the Philippines in October 1944. Despite suffering heavy
losses, the units equipped with new fighter proved that the N1K could
more than hold its own against P-38s and F6Fs. The improved N1K2-J
Shiden-KAI started to reach the front line by late 1944--in time to
defend the Home Islands. Here, it proved to be the best IJN fighter of
the war.