Mariia, 12, fled the devastation of the war in Ukraine and now lives in Aichi Prefecture, central Japan, with her mother and younger brother. She used to be positive and popular, but now in Japan she struggles to deal with the language barrier and to settle into her class. Mariia's classmates are doing their best to support her. Mikoto and Hanna especially want to become her friends. The three girls are finally able to overcome their language differences and build a deep relationship.

In the woods of northeastern Japan stands the "Drifting Mailbox." This unique mailbox receives letters from family members to loved ones who died in the 2011 Great East Japan Earthquake. Its custodian, Akagawa Yuji, recently started thinking about closing the mailbox. But some bereaved relatives still continue to send letters. Yuji decided to meet with some of them to explain his thinking. Twelve years on, Yuji and the bereaved family members share their thoughts for the first time.