A "Baku" lives in Mijun's dream.

No matter how difficult the reality is, I can do my best today because I am healed and encouraged by the existence of the baku in my dreams!
One day, she was told to move out of the apartment where she and her brother lived together, and decided to stay at the Date family, with her childhood friend.
Especially since I had a quarrel with my younger brother Masachika when I was little, I was told to choose one as my husband- !!
Someone said it was a dream!

source: https://www.mangaupdates.com/series/3cew8hq/baku-no-hanayome