Kimi ga Oshiete Kureta Koto (2000)

A young autistic woman, Mayuko, who has difficulty understanding and processing human emotions, meets with a young former psychiatrist, Shinichi, who is still getting over the unexpected death of his longtime girlfriend. Shinichi begins to help her with her skills of human interaction, but as he gets to know Mayuko better, he finds that she may be helping him to remember the feelings of love that he has forgotten in his grief. (TBS)