[2] Among her credits, Okada is best known for her writing and producing work on acclaimed anime series and films, including Toradora!, Anohana, Gosick, The Pet Girl of Sakurasou, Maquia: When the Promised Flower Blooms, and her original manga series and its anime adaptation O Maidens in Your Savage Season.

She has also stated that no one in her life "had high hopes for her" and that, as a senior, she was repeatedly told that she “would not survive in the real world.”[4] She went on to enroll at the Tokyo Amusement Media School to study entertainment industry and game design.

Through her studies, Okada developed a passion for screenwriting, but found it difficult to take it seriously as a profession due to her social anxiety.

Her earliest jobs included creating scenarios for direct-to-video pornography and transcribing interviews for a magazine.

Okada wrote the script for her directorial debut anime film Maquia: When the Promised Flower Blooms.