In this book, the mysterious café where customers arrive hoping to travel back in time welcomes four new guests:

- The father who could not allow his daughter to get married

- A woman who couldn't give Valentine's Day chocolates to her loved one

- A boy who wants to show his smile to his divorced parents

- A wife holding a child with no name…

They must follow the café's strict rules, however, and come back to the present before their coffee goes cold…