Closed Note (2007)

Kae Horii moves into her new flat in an undisclosed area of Kyoto While unpacking her belongings she discovers a hidden compartment behind a inconspicuous mirror In that compartment Kae finds a notebook that turns out to be a diary belonging to the previous tenant Later that evening Kae starts to read the diary The writer of the diary is Ibuki Mano a young lady about to embark on her first year as an elementary school teacher Ibuki is also in love with a man named Takashi who may or may not hold similar feelings for Ibuki