Tsubasa Yamaguchi books in order
18 books in the catalogue, about 66 hours of reading in all; the shortest takes 3 hours and the longest 4 hours.
1 series and 1 standalone book in the catalogue.
Blue Period
17 books 1 
Blue Period, Volume 1 4.1 h 2 
Blue Period, Volume 2 3.6 h 3 
Blue Period, Volume 3 3.8 h 4 
Blue Period, Volume 4 3.8 h 5 Blue Period, Volume 5 3.9 h 6 Blue Period, Volume 6 3.7 h 7 Blue Period, Volume 7 3.8 h 8 Blue Period, Volume 8 3.8 h 9 
Blue Period, Volume 9 3.6 h 10 Blue Period, Volume 10 4.0 h 11 
Blue Period, Volume 11 3.5 h 12 
Blue Period, Volume 12 3.5 h 13 Blue Period, Volume 13 3.8 h 14 Blue Period, Volume 14 3.9 h 15 Blue Period, Volume 15 3.3 h 16 Blue Period, Volume 16 3.5 h 17 
Blue Period, Volume 17 3.6 h
Blue Period, Volume 1 4.1 h 2 Blue Period, Volume 2 3.6 h 3 Blue Period, Volume 3 3.8 h 4 Blue Period, Volume 4 3.8 h 5 Blue Period, Volume 5 3.9 h 6 Blue Period, Volume 6 3.7 h 7 Blue Period, Volume 7 3.8 h 8 Blue Period, Volume 8 3.8 h 9 Blue Period, Volume 9 3.6 h 10 Blue Period, Volume 10 4.0 h 11 Blue Period, Volume 11 3.5 h 12 Blue Period, Volume 12 3.5 h 13 Blue Period, Volume 13 3.8 h 14 Blue Period, Volume 14 3.9 h 15 Blue Period, Volume 15 3.3 h 16 Blue Period, Volume 16 3.5 h 17 Blue Period, Volume 17 3.6 h 