Japan bird book

Hi all,

I’m going to be in Japan for a week on a cycling holiday and was wondering
if anyone has recommendations for bird guides? (I mean a book, not a
person..)

I’ll be with non-birders and there will be little time dedicated to birding,
but want to be able to id the incidentals.

Obviously, size/weight is an issue on the bike.

Any suggestions?

TIA

Paul