The Mitsubishi J8M "Shūsui" (Japanese: 三菱 J8M 秋水, literally "Autumn Water", used as a poetic term meaning "Sharp Sword" deriving from the swishing sound of a sword) was a Japanese World War II rocket-powered interceptor aircraft closely based on the German Messerschmitt Me 163 "Komet".
The Mitsubishi J8M was created after the Messerschmitt Me 163.
The Mitsubishi J8M "Shusui" was closely based on the Messerschmitt Me 163 leading me to think that it was created after the 163. 