Nothing can tear them apart, when two spirits find one another. Widower Takumi (Shido Nakamura) lives a quiet life together with his mum son Yuji (Akashi Takei) following the lack of mother and wife Mio (Yuko Takeuchi). Yuji unfailingly recalls her promise to him"I will be with you again in a year's time, once the rains come" Whenever they come across a woman sheltering from a monsoon downpour on the first anniversary of her passing, Takumi and Yuji have a walk in the forests. She's an uncanny resemblance to Mio, but has no recollection of who she actually is or what she does there. Family life resumes from where they left off, while Takumi and Mio's memories of their encounter in school. But their new life together is interrupted by the discovery of Mio's old journal, which shows that the secrets of her past and how they must say goodbye yet again in six weeks' time...