Tonton, the son of a powerful family, and Guest, from an ordinary family. Guest is the elder.

Guest used to take care of Tonton back when they wanted to act like a big sibling. Then Guest turned 20 and left the village.

A few years later, Tonton turned 20 and was told by his father to find a spouse to produce an heir. Tonton chose Guest without hesitation. Guest had just returned to the village. An engagement was decided without Guest's knowledge. Since the partner is from the Momose family, they cannot refuse.

Same-sex marriage is recognized. Both men and women are capable of pregnancy.