Family! Us. From a fake marriage, love was born, Takeru and Seishiro, who became a real husbands, and his little half-brother Reo.

One year ago, the three of them were strangers, but now they care for each other and are nurturing a family bond. In the midst of their lovey-dovey newlywed life, Seishiro, who works as his father's secretary as Minister of Justice Seishiro. Asakura, a respected member of the Diet invites him and his husband to a birthday party at Asakura Castle in Hachioji. Asakura has always had a hint of doubt about Seishiro's marriage... Takeru and Seishiro face new challenges as husbands and as a family.

Takeru and Seishiro are put to a new test!

Kyougoku-ke series order:
1: Kyougoku-ke no Kekkon
2: Kyougoku-ke no Shoya
3: Kyougoku-ke no Mitsugetsu
4: Kyougoku-ke no Junai
5: Kyougoku-ke no Chikai