The Professor's Beloved Equation (2006)

The Professor's Beloved Equation is a Japanese film released January 21, 2006 and directed by Takashi Koizumi. It is based on the novel The Housekeeper and the Professor.

More at Wikipedia.

Cast:

• Eri Fukatsu
• Kyoko（narrator from the book）
• The professor
• Root
• Takanari Saito
• The Teacher（Root after age 19）
• Akira Terao
• The widow