Ko Seirin

Prince of the Moonlight Country.
He is the son of the current king and the next king.

He had a half-brother, but due to an unexpected separation, Seirin is the only male heir to the throne.

Raised at court to be a butterfly and a flower, he is a naive son in a box.
He has a beautiful heart, a refined way of thinking about things, and is unquestioning of others.

Because he loves to spend time with birds, he has a large cage-like birdhouse in the court, where he spends most of his time.

He learns martial arts and academics and the art of courtly behaviour from Enrai, the Prince Taifu, which he will need when he eventually becomes king.

—— Love Theme: Transition × Adoration ——

Seirin, the first prince of the Moonlight Country, has his own reasons for not taking a wife.
Although he is the next king, he has no fiancée and only loves birds every day, but when he sneaks out of the court, their destiny begins to revolve.
Seirin, who wonders what he was born for - and is in agony about his life - meets the protagonist and for the first time makes a wish.
However, a rare encounter awakens the darkness that lies dormant in the court, and the two are led to a mysterious destiny.
This is a story of an earnest and wholesome love.