When the store is closed, people would drop their letters through a hole in the roll-up door, collected in a mailbox, and would receive a handwritten reply from Namiya in a milk box hung outside.

In 2012, three delinquents, Atsuya, Shota and Kohei, take shelter in the abandoned Namiya General Store after committing some petty crimes.

Staying until the morning, the boys' pillaging is mysteriously interrupted by an advice letter being dropped through the shutter, although nobody is outside.

When Kohei decides to reply, the mysteries and secrets of the old General Store come to light, as their letters transcend time and space to touch a variety of characters, revealing Namiya's past, and follows the many miracles that intertwine the lives of the seemingly unrelated cast.

The benevolent owner and sole manager of Namiya General Store, who takes it upon himself to respond to every troubled letter requesting advice that comes his way.

There were three performances, "Harmonica at dawn", "Civic until morning", and "Pray from the sky", and due to time constraints, "Answer in the milk box" and "Silent prayer in the Beatles" were cut.

[1] A Chinese adaptation produced by Emperor Motion Pictures and Wanda Media was released on 29 December 2017.