Hakuroku wa Ai wo Utau

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...? (Source: MangaPlaza)