Before the coffee gets cold

There's a little café in Japan where you can travel back in time. You will get a cup of hot coffee. You'll travel back in time staying seated in the same café at the same table with the same coffee in front of you. You can only meet someone you've seen in that café before. Your time travel lasts until the coffee gets cold. 

An intriguing book. With a small selection of characters. It's only a small café... It is the first part of a series. A colleague told me she only started to enjoy the story for real in the second book. So I wondered if I would like it. But I did! Very much so. I read it in one go. 

Fortunately the second in the series is already in my house as well. I think I'll have to be patient for the ones that follow.