Okada Yasui is a character in the 2003 anime film Winter Days, which is drawn from a collaborative linked poem of the same name. The character is based on a historical person who lived in the Owari region, the area around present-day Nagoya, in seventeenth-century Japan. Yasui was a wealthy shopkeeper and a representative of the townspeople, and he took an active part in literary culture as a haiku poet who attended and organized poetry gatherings. In late 1684, he hosted a session of local poets at which the poet Matsuo Bashō was the invited guest, and the linked verses composed during that session were later published under the title Winter Days.

Within the film, Yasui appears as one of the poets of that gathering, and his role is tied to the act of hosting, reflecting the collaborative nature of the source work. His most significant relationship is with Bashō, whom he invited to the session and received as an honored guest. As a figure, Yasui represents the cultivated merchant class of his time, with his position as a rich shopkeeper and his standing among the townspeople placing him at the meeting point of commercial life and literary society. His involvement in poetry was expressed partly through hospitality, as he used his means and social influence to bring poets together.

In his later years, Yasui gained distinction in the tea ceremony, and his poetry continued to appear in subsequent collections, including the anthology Spring Days. He died in 1743.