Kohaikai Research is a scholarly study that reconsiders early haikai, especially the Teimon and Danrin traditions before Basho, through both primary materials and language. By examining associative expression, the bibliography of early haikai books, and individual texts, it reassesses the literary and cultural range of the early Edo period.

A study that follows the language and materials of early haikai to illuminate the literary world of the early Edo period from multiple perspectives.