Our Kingdom is a contemporary-set BL manga. I bought this particular volume used.
Review:
Akira and Rei are now a couple, although Akira still seems to think Rei's frequent kisses are more due to his being half-foreign than anything. There's still no indication that the adults around them realize what's going on between them, or maybe they just don't care.
Yuji, Akira's father's younger brother, arrives at the beginning of this volume and immediately takes to Akira, much to Rei's annoyance. Akira understandably wants to spend time with his uncle, and Rei is massively jealous. When Yuji has a chance to spend some time alone with Akira, he offers to take Akira home with him, thereby leaving Rei the sole Takatou family heir. Akira refuses - although he firmly believes that Rei will (and should) be chosen to take over the family name, all he wants is to be together with Rei.
Later in the volume, there's more drama as Raoul makes another appearance and Akira starts to doubt Rei's feelings, wondering if he's only around because Akira reminds him of Akira's father.

