8 books in series

憂鬱な朝 / Yūutsu na asa

憂鬱な朝 / Yūutsu na asa is a 8-book series with 8 primary works first released in 2009 with contributions by Shoko Hidaka.

Blue Morning, Vol. 1
Blue Morning, Vol. 2
Blue Morning, Vol. 3
Blue Morning, Vol. 4
Blue Morning, Vol. 5
Blue Morning, Vol. 6
Blue Morning, Vol. 7
Blue Morning, Vol. 8