Blue Morning volume 4 features story and art by Shouko Hidaka.

Katsuragi's lineage is finally revealed. Once the truth is discovered, he leaves the Kuze household for the Ishizaki home in an attempt to support Akihito from the outside. However, when rumors of Akihito's impropriety reach his ears, he rushes back to see his young master. Akihito then makes the dramatic confession that not only has he broken off the engagement crucial to the rank Katsuragi is so proud of, but he has also made threats against Marquise Moriyama!