I don't know anything about the Tsurugi, but the Kikka article has substantial errors which means it was written a long time ago. This makes me think the info on the Tsurugi might not be correct too.
The Japanese came up with the Kikka, a.k.a. Kitsuka, for use as a jet bomber. Its airframe and engines were roughly based on the German Me 262. I've heard there were three engines planned for use: the Ne-12 (which was applied), the Ne-20 (also applied) and the Ne-330 (incomplete). Was the Ne-330 an original engine, or was it a developed version of a previous engine?
Japan had already developed a jet engine that could have become operational (Ne-12B) when it merged elements of a German axial-flow jet engine with the Ne-12 to create the Ne-20. They lacked enough technical details to create a complete copy. Weird how wartime propaganda influced later aviation writers.