The life of bestselling autistic author, Donna Williams was researched for the role of Mayuko played by Rie Tomosaka. Donna met in Tokyo with both Rie Tomosaka and Takaya Kamikawa shortly after the release of the series.
Two songs written, composed and sung by autistic author/songwriter, Donna Williams, feature as one of the theme songs throughout the series and the love song in the final episode.