so-bin books in order
14 books in the catalogue, about 78 hours of reading in all; the shortest takes 5 hours and the longest 7 hours.
14 standalone books in the catalogue.
Standalone books
Overlord, Volume 6 5.6 h 
オーバーロード1 不死者の王 4.8 h 
オーバーロード2 漆黒の戦士 4.8 h Overlord, Volume 4 5.7 h Overlord, Volume 5 5.0 h 
Overlord, Volume 8 5.1 h 
Overlord, Volume 10 6.2 h 
Overlord, Volume 11 6.3 h 
Overlord, Volume 9 6.0 h 
Overlord, Volume 12 5.4 h 
Overlord, Volume 13 7.5 h 
Overlord, Volume 14 7.2 h 
Overlord, Volume 15 4.5 h Overlord, Volume 16 4.5 h
オーバーロード1 不死者の王 4.8 h オーバーロード2 漆黒の戦士 4.8 h Overlord, Volume 4 5.7 h Overlord, Volume 5 5.0 h Overlord, Volume 8 5.1 h Overlord, Volume 10 6.2 h Overlord, Volume 11 6.3 h Overlord, Volume 9 6.0 h Overlord, Volume 12 5.4 h Overlord, Volume 13 7.5 h Overlord, Volume 14 7.2 h Overlord, Volume 15 4.5 h Overlord, Volume 16 4.5 h