"Iwasaki's System of Reconstructing Japanese (ISReJP)" is a conlang which a language researcher Junichi Iwasaki has contrived and produced for his research of mental disorders. Although there are many conlangs all over the world, ISReJP is used in a very closed community.

In ISReJP, the mentality and the emotion of humans transform the framework itself of part of speech and tense, which realize this language, by means of incorporating the nature of the egos of persons with mental disorders into the structure of nominative.

Iwasaki has a profound contemplation on persons with language disorders in combination with dissociative disorders or schizophrenia and persons with a extreme dread of linguistic expression, and is creating ISReJP as one of deeds of thinking what it means that "humans exchange parols" and "humans communicate something to others".

I regard Iwasaki's System of Reconstructing Japanese (ISReJP) as a linguistic expression which itself embodies the question of "What a parol is" by grammatical structure, so I have strong empathies with ISReJP as a work of language art and Iwasaki's thought itself, and now engage in research and joint activities with him.