Manga by author Kana Riyuma

Louie, the sixth prince born from an affair between the king and a maid, has a secret he can't tell anyone. Suddenly, he is sent off by the king to be married to someone in a foreign land as a "princess," being promised that his mother will be safe only if things go smoothly. The kingdom he is being sent to is the neighboring kingdom, where people live in harmony with wolves. However, the evening the ceremony is finished, Louie's new "mate" Prince Zeth soon discovers that he is not the princess he was said to be... now begins a new story in the kingdom of wolves!+

Saya, son of Louie and Zeth and a part of the Royal family, has fallen for the white deer Yullur. Though they are so far apart in age, Saya has always held on to the playful vow he made as a child to make Yullur his mate. Currently, Saya has been unable to decide on a candidate to be his mate, and is beginning to feel the pressure to find one as he is royalty. Realizing now that he cannot avoid how he has always felt, now might just be the time to confess his feelings. However, Yullur seems to have different thoughts...?