4 books in series

Sleepy Princess in the Demon Castle

Sleepy Princess in the Demon Castle is a 4-book series with 4 released primary works first released in 2016 with contributions by Kagiji Kumanomata and 熊之股鍵次.

魔王城でおやすみ. Maō-jō de Oyasumi. Good Night in Demon Castle

Sleepy Princess in the Demon Castle, Vol. 1
Sleepy Princess in the Demon Castle, Vol. 2
Sleepy Princess in the Demon Castle, Vol. 3
Sleepy Princess in the Demon Castle, Vol. 4