After, Shogo Ogami’s death in Hiroshima, Detective Shuichi Hioka successfully implemented Shogo Ogami’s plan, which was to control the yakuza to prevent further gang wars and save innocent people from getting harmed. Shuichi Hioka manages the criminal organizations, but, due to one evil person who gets released from prison, the situation drastically changes.

In 2012, Atsuya (Ryosuke Yamada) and his 2 childhood friends do something bad and run into an old general store. They decide to stay there until the morning. Late into the night, Atsuya sees a letter in the mailbox. The letter is addressed to the Namiya General Store and the letter was written by someone to consult about worries. Incredibly, the letter was written 32 years ago. The mailbox is somehow connected to the year 1980. Atsuya and his friends decide to write a reply and place their letter in the mailbox.

Taking place during the full-moon night of traditional dances in August and set on the Japanese island of Amami-Oshima, the drama centers on a 14-year-old boy who finds a dead body floating in the sea. The young man enlists the help of his girlfriend to solve the mystery. The pair “will learn to become adults by experiencing the interwoven cycles of life, death and love.