While the coffee cools

What would you say to a little flashback? In one small Japanese café called Funiculi Funicula they offer such an option. However, you have to meet challenging conditions, the presence doesn't change and time is limited - you have to return before your coffee gets cold. However, four café guests took courage and travelled back to the past. That is what this book is about. What did the journey through time bring them and how did it change their lives?